SMOKELESS FIREPIT

Abstract

A smokeless firepit including a first bottom, a second bottom located above the first bottom, an inner wall extending upwardly from the second bottom, an outer wall extending upwardly from the first bottom, and a top plate connecting the inner and outer walls. The second bottom intakes primary combustion air and secondary combustion air. The secondary combustion air is configured to be received at a bottom of the outer wall, pass upward between the inner wall and the outer wall, and enter the burn chamber at a top of the inner wall underneath the top plate when the firepit is in the upright position and burning fuel.

Description

A portion of the disclosure of this patent document contains material that is subject to copyright protection. The copyright owner has no objection to the reproduction of the patent document or the patent disclosure, as it appears in the U.S. Patent and Trademark Office patent file or records, but otherwise reserves all copyright rights whatsoever.

FEDERALLY SPONSORED RESEARCH AND DEVELOPMENT

Not Applicable

BACKGROUND OF THE INVENTION

The present invention relates generally to firepits. More particularly, this invention pertains to “smokeless” firepits.

Smokeless firepits or secondary combustion firepits such as the Solo Stove® and Breeo® are known in the art. Smokeless firepits are not completely smokeless, but produce much less smoke than standard firepits by utilizing a secondary combustion system. Biomass (e.g., firewood or wood pellets) is placed on a perforated base (i.e., base plate) at the bottom of a burn chamber of the firepit. The base of the burn chamber is elevated off the ground such that primary combustion air can enter the firepit at the bottom of the firepit and travel up through the perforated base to the wood in the burn chamber to initiate primary combustion. Secondary combustion air enters the firepit through the bottom, travels up along the side of the burn chamber between a burn chamber sidewall and an outer wall of the firepit, and is injected into the top of the burn chamber as preheated secondary combustion air. The preheated secondary combustion air burns the gasified biomass (i.e., the smoke generated from primary combustion) at the top of the burn chamber to produce a “smokeless” (i.e., reduced smoke) firepit. Most smokeless firepits include a top ring or cover defining the top of the burn chamber, below which the secondary combustion air is injected into the burn chamber.

Ash, clinkers, and charcoal enter the space between the base plate and the bottom of the firepit, filling the space between the base plate and a bottom of the firepit or landing on the ground below the base plate. These smokeless firepit designs present issues with cleaning the ash out of the firepit or overheating the ground (e.g., deck or patio) below the firepit. Additionally, these designs allow unheated air to enter the burn chamber near the outer edge of the perforated base plate, reducing the temperature along the sidewall of the burn chamber and reducing the burn efficiency of the firepit, which in turn increases the smoke emitted by the firepit.

SUMMARY OF THE INVENTION

Aspects of the invention provide a smokeless firepit including primary combustion and secondary combustion (e.g., smoke burning). The firepit includes a first bottom stood off from the ground by feet, a second bottom spaced above the first bottom, an inner wall extending upwardly from the second bottom, and an outer wall surrounding the inner wall, and a top plate connecting the inner wall to the outer wall. Primary combustion air travels up through the first bottom or in through the outer wall into the space between the first and second bottoms and then up through the second bottom at a center of the second bottom into a primary combustion air manifold. The primary combustion air manifold extends upwardly from the second bottom and includes a cover extending out over a riser. Primary combustion air exits the manifold laterally beneath the top cover. Secondary combustion air enters the firepit through the first bottom or through the outer wall at a bottom of the outer wall and travels up between the inner and outer walls to enter the burn chamber through the inner wall at a top of the inner wall beneath the top plate.

In one aspect, a smokeless firepit includes a first bottom configured to pass primary combustion air from below the first bottom to above the first bottom when the firepit is in an upright position on a surface and burning fuel and a second bottom spaced apart from and located above the first bottom. The second bottom is configured to pass the primary combustion air from below the second bottom to above the second bottom at a center of the second bottom when the firepit is in the upright position and burning fuel. The smokeless firepit further includes a plurality of feet connected to the first bottom and configured to space the first bottom from the surface upon which the firepit is resting when the firepit is on the surface in the upright position and an inner wall extending upwardly from the second bottom. The inner wall and the second bottom define a burn chamber for retaining and burning fuel therein. The smokeless firepit further includes an outer wall extending upwardly from the first bottom and spaced apart from the inner wall and a top plate connecting the inner wall and the outer wall. Secondary combustion air is configured to be received at a bottom of the outer wall, pass upward between the inner wall and the outer wall, and enter the burn chamber at a top of the inner wall underneath the top plate when the firepit is in the upright position and burning fuel.

In another aspect, a firepit includes a first bottom comprising a plurality of air intakes configured to allow air therethrough and a second bottom connected to and elevated above the first bottom. The second bottom includes a centrally located primary combustion air intake and secondary air intakes. The second bottom is configured to divide the air into primary combustion air which passes through the primary combustion air intake and secondary combustion air which passes through the secondary air intakes. The firepit further includes an outer wall extending upwardly from the first bottom and an inner wall extending upwardly from the second bottom. The inner wall and the second bottom define a burn chamber for retaining and burning fuel therein. The inner wall is spaced inwardly of the outer wall which defines a secondary space between the outer and inner walls for the secondary combustion air to travel therethrough. The inner wall includes a plurality of secondary combustion air outlets located adjacent to a top end of the inner wall. The firepit further includes a top plate connecting the inner wall and the outer wall. The secondary combustion air is configured to flow from the second bottom, through the secondary space, through the plurality of secondary combustion air outlets of the inner wall, and into the burn chamber underneath the top plate.

In another aspect, a method includes an initial step of providing a firepit. The firepit can include a first bottom with a plurality of air intakes and a second bottom connected to and elevated above the first bottom. The second bottom includes a centrally located primary combustion air intake and secondary air intakes. The firepit further includes an outer wall extending upwardly from the first bottom and an inner wall extending upwardly from the second bottom. The inner wall and the second bottom define a burn chamber for retaining and burning fuel therein. The inner wall is spaced inwardly of the outer wall which defines a secondary space between the outer and inner walls for the secondary combustion air to travel therethrough. The inner wall includes a plurality of secondary combustion air outlets located adjacent to a top end of the inner wall. The firepit further includes a top plate connecting the inner wall and the outer wall. The method further includes a step of initiating a primary combustion of the fuel in the burn chamber. The method further includes a step of intaking air, by the first bottom, through the plurality of air intakes in the first bottom. The method further includes a step of dividing the air, by the second bottom, into primary combustion air which passes through the primary combustion air intake and secondary combustion air which passes through the secondary air intakes. The method further includes a step of preheating, by heat emanating from the second bottom, the primary combustion air. The method further includes a step of guiding, by the second bottom, the primary combustion air into the burn chamber. The method further includes a step of guiding, by the second bottom, the secondary combustion air into the secondary space between the outer and inner walls. The method further includes a step of preheating, by heat emanating from the inner wall, the secondary combustion air which passes through the secondary space. The method further includes a step of guiding, by the outer and inner walls and the top plate, the secondary combustion air through the secondary space and toward the plurality of secondary combustion air outlets of the inner wall. The method further includes a step of guiding, by the plurality of secondary combustion air outlets of the inner wall, the secondary combustion air from the secondary space into the burn chamber underneath the top plate. The method further includes a step of initiating a secondary combustion by introducing the secondary combustion air into the burn chamber and burning smoke and gases released by the primary combustion of the fuel to reduce smoke outputted by the firepit.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is an elevated perspective and partial cutaway view of the smokeless firepit, with directional arrows illustrating the airflow of primary combustion air inside the burn chamber.

FIG. 2 is a bottom perspective and partial cutaway view of the smokeless firepit of FIG. 1, with directional arrows illustrating the airflow of both primary combustion air and secondary combustion air which is introduced at the top of the burn chamber.

FIG. 3 is a side cutaway, partially exploded view of the smokeless firepit of FIG. 1.

FIG. 4 is an exploded view of a primary combustion air manifold of the firepit of FIG. 1.

FIG. 5 is a side cutaway view of the firepit of FIG. 1, including an ash shovel.

FIG. 6 is a front view of the ash shovel.

FIG. 7 is a side view of the ash shovel.

FIG. 8 is a top view of the ash shovel.

FIG. 9 is a flowchart of a method for reducing smoke in a firepit.

Reference will now be made in detail to optional embodiments of the invention, examples of which are illustrated in accompanying drawings. Whenever possible, the same reference numbers are used in the drawing and in the description referring to the same or like parts.

DETAILED DESCRIPTION OF THE INVENTION

While the making and using of various embodiments of the present invention are discussed in detail below, it should be appreciated that the present invention provides many applicable inventive concepts that can be embodied in a wide variety of specific contexts. The specific embodiments discussed herein are merely illustrative of specific ways to make and use the invention and do not delimit the scope of the invention.

To facilitate the understanding of the embodiments described herein, a number of terms are defined below. The terms defined herein have meanings as commonly understood by a person of ordinary skill in the areas relevant to the present invention. Terms such as “a,” “an,” and “the” are not intended to refer to only a singular entity, but rather include the general class of which a specific example may be used for illustration. The terminology herein is used to describe specific embodiments of the invention, but their usage does not delimit the invention, except as set forth in the claims.

As described herein, an upright position is considered to be the position of apparatus components while in proper operation or in a natural resting position as described herein. The upright position of the firepit is illustrated in FIG. 1, wherein the feet of the firepit rest upon a generally horizontal surface and the open end of the firepit is generally upwardly directed. Vertical, horizontal, above, below, side, top, bottom and other orientation terms are described with respect to this upright position during operation unless otherwise specified. The term “when” is used to specify orientation for relative positions of components, not as a temporal limitation of the claims or apparatus described and claimed herein unless otherwise specified. The terms “above”, “below”, “over”, and “under” mean “having an elevation or vertical height greater or lesser than” and are not intended to imply that one object or component is directly over or under another object or component.

The phrase “in one embodiment,” as used herein does not necessarily refer to the same embodiment, although it may. Conditional language used herein, such as, among others, “can,” “might,” “may,” “e.g.,” and the like, unless specifically stated otherwise, or otherwise understood within the context as used, is generally intended to convey that certain embodiments include, while other embodiments do not include, certain features, elements and/or states. Thus, such conditional language is not generally intended to imply that features, elements and/or states are in any way required for one or more embodiments or that one or more embodiments necessarily include logic for deciding, with or without operator input or prompting, whether these features, elements and/or states are included or are to be performed in any particular embodiment.

In one embodiment, a smokeless firepit 10 includes primary combustion and secondary combustion (i.e., smoke burning). The firepit 10 includes a first bottom 12 stood off from the ground by feet 14, a second bottom 16 spaced above and parallel to the first bottom 12, an inner wall 18 extending upwardly from the second bottom 16, and an outer wall 20 surrounding the inner wall 18, and a top plate 22 connecting the inner wall 18 to the outer wall 20. The outer wall 20 respectively connects the first and second bottoms 12, 16 about their respective outer perimeters. The second bottom 16 and the inner wall 18 define a burn chamber 24 for burning fuel, such as wood or other biomass, therein. In one embodiment, the firepit 10 is constructed mainly of stainless steel.

In one embodiment, the second bottom 16 is spaced from the first bottom 12 by the outer wall 20 which attaches to both the first and second bottoms 12, 16. Additionally or alternatively, a support frame 26 can be located between and connect the first bottom 12 and the second bottom 16. The support frame 26 supports the second bottom 16 and spaces the second bottom 16 from the first bottom 12. The support frame 26 also guides air toward the burn chamber. For instance, the support frame 26 can guide the primary combustion air from an outer perimeter of the first bottom 12 to the center of the second bottom 16. The support frame 26 may comprise one or more support beams. For example, two support beams in an X-bracing configuration may support the second bottom 16. In one embodiment, the support beams can guide the primary and secondary combustion air toward the burn chamber 24 due to their structural configuration. The support beams can define quadrants or channels for sectioning and guiding the primary and secondary combustion air.

Primary combustion air travels up through the first bottom 12 or in through the outer wall 20 into a primary space 28 between the first and second bottoms 12, 16 and then up through the second bottom 16 at one or more central opening(s) 30 of the second bottom 16, near or directly at a center point of the second bottom 16, and subsequently into a primary combustion air manifold 32 which directs the primary combustion air into the burn chamber 24 (FIG. 2). In one embodiment, the first bottom 12 has recesses 34 about a perimeter thereof to allow the primary combustion air to pass up through or by the first bottom 12. More particularly, the recesses 34 may intake the air, which passes therethrough in between the inside facing surface of the outer wall 20 and the first bottom 12.

The primary combustion air manifold 32 extends upwardly from the second bottom 16. The air manifold 32 comprises an elevated burner 32 which introduces the primary combustion air into the burn chamber 24 above a top surface of the second bottom 16 when the firepit 10 is in the upright position and burning fuel, thus accommodating a buildup of combusted matter on the second bottom without clogging airflow of the primary combustion air therethrough. The elevated burner 32 comprises a riser 36 connected to and extending upwardly from the second bottom 16 and a cover 38 connected to the riser 36 and extending beyond an outer perimeter of the riser 36 (FIGS. 3-4). The riser 36 is coaxial with the central opening 30 of the second bottom 16. Primary combustion air exits the air manifold 32 laterally beneath the cover 38 via primary combustion air outlets 40, e.g., recesses, in the top end of the riser 36, between the riser 36 and the cover 38. In one embodiment, the outlets 40 can be in the form of holes in the riser 36 which are located at or near the top of the riser 36. The riser 36 receives the primary combustion air from below the second bottom 16, i.e., the central opening 30, and directs the primary combustion air into the burn chamber 24 at a top end thereof. The cover 38 prevents the fuel and combusted matter from entering the riser 36 and clogging the primary space 28 between the second bottom 16 and the first bottom 12, allowing the primary combustion air to freely flow through the primary space 28, through the riser 36, and into the burn chamber 24. In one embodiment, pins 42 disposed in pin holes (unnumbered) interconnect the second bottom 16, the riser 36, and the cover 38 with one another (FIG. 3). The air manifold 32 may be comprised of cast iron.

Secondary combustion air enters the firepit 10 through the first bottom 12 or through the outer wall 20 at a bottom of the outer wall 20. In one embodiment, the secondary combustion air passes through recesses 34 in the first bottom 12 and subsequently through recesses 44 in the second bottom 16. Thereafter, the secondary combustion air travels up into a secondary space 46 between the inner and outer walls 18, 20 to enter the burn chamber 24 through the inner wall 18 at a top of the inner wall 18 beneath the top plate 22 (FIG. 2). Air outlets 48 in the inner wall 18, at the top thereof, allows the secondary combustion air to pass from the secondary space 46 and into the burn chamber 24 (FIG. 2). In one embodiment, the air outlets 48 are holes 48 extending through the inner wall 18. In one embodiment, the air outlets 48 can be grooves or recesses in the inner wall 18 for allowing secondary combustion air therethrough between the inner wall 18 and the top plate 22.

When fuel is burned in the firepit 10, the fuel rests on the second bottom 16 and/or the top cover 38 of the primary combustion air manifold 32. Primary combustion air is preheated as it passes under the second bottom 16 from the outside edge toward the center thereof and up into the primary combustion air manifold 32. Therein, heat emanating from the second bottom 16 and the air manifold 32 may preheat the primary combustion air. The preheated primary combustion air enters the burn chamber 24 and interacts with the fuel upon exiting the primary combustion air manifold 32. Secondary combustion air is preheated as it travels up through the secondary space 46 from heat emanating from the inner wall 18. The preheated secondary combustion air ignites smoke and gases released from the fuel by the primary combustion just under the top plate 22 and toward a center of the firepit.

Because the fuel rests on the second bottom 16 and top cover 38 of the primary air manifold 32, ash and clinkers cannot pass through the riser 36 and below the second bottom 16 into the primary space 28 between the first and second bottoms 12, 16 or into the secondary space 46 between the inner and outer walls 18, 20. All of the ash, coals, and clinkers can be removed from the firepit 10 by dumping the firepit 10 or by scooping the firepit 10 out.

The recesses 34, 44 of the first and second bottoms 12, 16 are located in and circumferentially spaced about the outer perimeters of the first and second bottoms 12, 16, respectively. The recesses 34, 44 define air gaps 34, 44 in between the outer wall 20 and the first and second bottoms 12, 16. Each recess 34, 44 extends inwardly into the body of each respective bottom 12, 16 from the outer perimeter thereof. Each recess 34, 44 defines an open end adjacent to the outer perimeter and a recess perimeter wall (FIGS. 1-2). Each open end is located adjacent to the outer wall 20. Each recess 44 of the second bottom 16 terminates adjacent to and outwardly of a bottom edge of the inner wall 18 such that each recess perimeter wall is located outwardly of the inner wall (FIG. 1). In other words, each recess 44 does not extend inwardly beyond the inner wall 18 so that air cannot enter the burn chamber via a given recess 44. Thus, the secondary combustion air is prevented from entering the burn chamber 24 at the bottom edge of the inner wall 18 and instead passes through each air gap 44 defined by each recess 44 and accordingly into the secondary space 46. In one embodiment, the recesses 34 of the first bottom 16 are substantially aligned with the recesses 44 of the second bottom 16, allowing the secondary combustion air to freely pass respectively through the recesses 34, 44. As used herein, the phrase substantially aligned may refer to an alignment of the centers of the recesses 34, 44, plus or minus one inch (2.54 cm). In one embodiment, the recesses 34, 44 are identical in shape and size, except for allowable tolerances known in the art, to thereby allow the secondary combustion air to pass through the first and second bottoms 12, 16 without being redirected or otherwise slowed down by the second bottom 16.

In one embodiment, the second bottom 16 is configured to dually intake the primary combustion air and the secondary combustion air. Therein, the second bottom may comprise at least one primary combustion air intake 30, e.g., central opening 30, configured to intake the primary combustion air and at least one secondary combustion air intake 44, e.g., the recesses 44, configured to intake the secondary combustion air. Hence, the second bottom 16 and/or the support frame 26 can be configured to divert airflow, accordingly partitioning the airflow into primary combustion which air passes through the primary space 28, and thereafter the center air intake 30, and secondary combustion air which passes through the outer perimeter recesses 44 and into the secondary space 46. Thereby, the second bottom 16 may simultaneously perform the functions of providing a bottom for the burn chamber 24 and partition airflow into, and subsequently intake, primary and secondary combustion air.

The top plate 22 is connected to inner and outer walls 18, 20 and seals a top end of the secondary space 46. The top plate 22 comprises an inner perimeter and an outer perimeter. The top plate 22 comprises recesses 50 in its inner perimeter. The recesses define protrusions 52 in between adjacent recesses 50. Each recess 50 of the top plate 22 allows combusted matter therethrough, preventing the firepit 10 from overheating. Each protrusion 52 of the top plate 22 prevents combusted material from exiting the burn chamber 24, which improves the quality and duration of the secondary combustion, thus further reducing smoke emitted by the firepit 10.

The top plate 22 extends outwardly of the outer wall 20, and the top plate 22 extends inwardly beyond the inner wall 18 toward a center of the burn chamber 24. The top plate 22 at least partially extends within the burn chamber 24. The top plate 22 inwardly directs the secondary combustion air, preventing the secondary combustion air from immediately exiting the burn chamber 24. The top plate 22 defines a secondary combustion area within the burn chamber 24, which is an area located adjacent to an underside of the top plate 22 and the top of the inner wall 18. Hence, the top plate 22 prevents the secondary combustion air from immediately exiting the burn chamber such that the secondary combustion air is forced to temporarily stay within the secondary combustion area adjacent to the underside of the top plate for igniting smoke and gases released by a previous primary combustion of the fuel within the burn chamber 24.

In one embodiment, the firepit 10 is generally cylindrical. Thereby, the first and second bottoms 12, 16 may have circular cross-sections, the inner and outer walls 18, 20 may each define annular walls, and the top plate 22 may comprise an annular ring. However, it is conceivable that the firepit may be differently configured to have a generally rectangular, triangular, or other desired shape.

The firepit 10 includes a shovel 60 for removing combusted material, such as ash or other debris. The shovel 60 has a shovel body 62 and a handle 64 extending upwardly from the shovel body 62. The handle 64 has a length greater than a depth of the firepit. In other words, the handle 64 has a length that is greater than the length of the inner wall 18, as is clearly shown in FIG. 5. The shovel 60, and more particularly the shovel body 62, has a width that is less than a distance between the air manifold 32, e.g., the cover 38, and the inner wall 18, as is clearly shown in FIG. 5.

Referring to FIG. 9, there is shown a flowchart of a method 100 for reducing smoke outputted by a firepit 10. The method 100 can include an initial step of providing a firepit 10. At step 102, the method 100 can also include initiating a primary combustion, and therein a user may place fuel onto the air manifold 32 and the second bottom 16 and thereafter ignite the fuel within the burn chamber 24. At step 104, the first bottom 12 and/or the outer wall 20 of the firepit 10 may intake air. For example, air may flow into the firepit 10 via the recesses 34 at the outer perimeter of the first bottom 12, between the outer wall 20 and the first bottom 12. At step 106, the second bottom 16 and/or the support frame 26 can divide the air into primary and secondary combustion air. At step 108, the primary combustion air may be guided into and preheated within the primary space 28, e.g., via heat emanating from the second bottom 16. Thereafter, the primary combustion air may be guided through the center air intake 30 of the second bottom 16, through the air manifold 32, and into the burn chamber 24 above the topmost surface of the second bottom 16. At step 110, the secondary combustion air may be guided and preheated, e.g., within the secondary space 46 via heat emanating from the inner wall 18. The secondary combustion air may be guided through the second bottom 16, the secondary space 46, the air outlets 48 of the inner wall 18, and into the burn chamber 24. At step 112, the method can further include initiating a secondary combustion to reduce smoke outputted by the firepit 10. Therein, the secondary combustion air may assist in further burning smoke and gasses at the top of the burn chamber 24 to substantially reduce the smoke outputted by the firepit.

This written description uses examples to disclose the invention and also to enable any person skilled in the art to practice the invention, including making and using any devices or systems and performing any incorporated methods. The patentable scope of the invention is defined by the claims, and may include other examples that occur to those skilled in the art. Such other examples are intended to be within the scope of the claims if they have structural elements that do not differ from the literal language of the claims, or if they include equivalent structural elements with insubstantial differences from the literal languages of the claims.

It will be understood that the particular embodiments described herein are shown by way of illustration and not as limitations of the invention. The principal features of this invention may be employed in various embodiments without departing from the scope of the invention. Those of ordinary skill in the art will recognize numerous equivalents to the specific procedures described herein. Such equivalents are considered to be within the scope of this invention and are covered by the claims.

All of the compositions and/or methods disclosed and claimed herein may be made and/or executed without undue experimentation in light of the present disclosure. While the compositions and methods of this invention have been described in terms of the embodiments included herein, it will be apparent to those of ordinary skill in the art that variations may be applied to the compositions and/or methods and in the steps or in the sequence of steps of the method described herein without departing from the concept, spirit, and scope of the invention. All such similar substitutes and modifications apparent to those skilled in the art are deemed to be within the spirit, scope, and concept of the invention as defined by the appended claims.

Thus, although there have been described particular embodiments of the invention of a new and useful SMOKELESS FIREPIT it is not intended that such references be construed as limitations upon the scope of this invention except as set forth in the following claims.

Claims

1. A smokeless firepit comprising: a first bottom configured to pass primary combustion air from below the first bottom to above the first bottom when the firepit is in an upright position on a surface and burning fuel;a second bottom spaced apart from and located above the first bottom, the second bottom configured to pass the primary combustion air from below the second bottom to above the second bottom at a center of the second bottom when the firepit is in the upright position on the surface and burning fuel;a plurality of feet extending downward from the first bottom and configured to space the first bottom from the surface when the firepit is on the surface in the upright position;an inner wall extending upwardly from the second bottom, the inner wall and the second bottom defining a burn chamber for retaining and burning fuel therein;an outer wall extending upwardly from the first bottom and spaced apart from the inner wall; anda top plate extending inwardly from the outer wall,wherein secondary combustion air is configured to be received at a bottom of the outer wall, pass upward between the inner wall and the outer wall, and enter the burn chamber at a top of the inner wall underneath the top plate when the firepit is in the upright position and burning fuel.

2. The smokeless firepit of claim 1, further comprising: a primary combustion air manifold located about the center of the second bottom; andthe primary combustion air manifold is configured to receive the primary combustion air from below the second bottom and direct the primary combustion air into the burn chamber.

3. The smokeless firepit of claim 2, wherein: the primary combustion air manifold comprises an elevated burner which introduces the primary combustion air into the burn chamber above a top surface of the second bottom when the firepit is in the upright position and burning fuel, thus accommodating a buildup of combusted matter on the second bottom without clogging flow of the primary combustion air; andthe elevated burner comprises: a riser and extending upwardly from the second bottom, the riser configured to receive the primary combustion air from below the second bottom and direct the primary combustion air into the burn chamber at a top end of the riser; anda cover at a top of the riser, said cover extending beyond an outer perimeter of the riser, said cover configured to prevent fuel and combusted matter from entering the riser and clogging a primary space between the second bottom and the first bottom thus allowing the primary combustion air to freely flow through the primary space, through the riser, and into the burn chamber under the cover.

4. The smokeless firepit of claim 3, wherein: the riser is connected to the second bottom at a bottom end of the riser;the cover is connected to the riser at the top end of the riser;the riser comprises a plurality of primary combustion air outlets at the top end of the riser; andthe plurality of primary combustion air outlets of the riser are each configured to provide primary combustion air from inside the riser to the burn chamber when the firepit is in the upright position and burning fuel.

5. The smokeless firepit of claim 1, wherein: the first bottom comprises an outer perimeter connected to the outer wall;the second bottom comprises an outer perimeter connected to the outer wall; andthe outer wall respectively connects the first bottom to the second bottom about the outer perimeters of the first bottom and the second bottom.

6. The smokeless firepit of claim 1, wherein: the second bottom comprises an outer perimeter connected to the outer wall;the second bottom comprises recesses in the outer perimeter; andthe recesses are circumferentially spaced about the outer perimeter and define air gaps between the outer wall and the second bottom, allowing the secondary combustion air to travel upward from below the second bottom to above the second bottom between the inner wall and the outer wall when the firepit is in the upright position and burning fuel.

7. The smokeless firepit of claim 6, wherein: each recess extends inwardly into the second bottom from the outer perimeter which defines an open end adjacent to the outer perimeter and a recess perimeter wall;each open end is located adjacent to the outer wall;each recess terminates adjacent to and outwardly of a bottom edge of the inner wall such that each recess perimeter wall is located radially outwardly of the inner wall; andthe secondary combustion air is prevented from entering the burn chamber at the bottom edge of the inner wall and instead passes through each air gap defined by each recess.

8. The smokeless firepit of claim 6, wherein: the first bottom comprises an outer perimeter connected to the outer wall;the first bottom comprises recesses in the outer perimeter;the recesses of the first bottom are circumferentially spaced about the outer perimeter and define air gaps in between the outer wall and the first bottom; andthe recesses of the first bottom are substantially aligned with the recesses of the second bottom, allowing the secondary combustion air to freely pass respectively through the recesses of the first bottom and the recesses of the second bottom and subsequently in between the outer wall and the inner wall.

9. The smokeless firepit of claim 8, wherein: the recesses of the first bottom are identical in shape and size to the recesses of the second bottom, allowing the secondary combustion air to pass through the first bottom and the second bottom without being redirected or otherwise slowed down by the second bottom.

10. The smokeless firepit of claim 1, wherein: the second bottom is configured to dually intake the primary combustion air and the secondary combustion air;the second bottom comprises at least one primary combustion air intake configured to intake the primary combustion air; andthe second bottom comprises at least one secondary combustion air intake configured to intake the secondary combustion air.

11. The smokeless firepit of claim 1, wherein: the second bottom comprises a center air intake located at the center of the second bottom;the second bottom comprises outer perimeter recesses circumferentially spaced about an outer perimeter of the second bottom; andthe second bottom is configured to divert airflow such that the primary combustion air passes through the center air intake and the secondary combustion air passes through the perimeter recesses of the second bottom and subsequently in between the inner wall and the outer wall when the firepit is in the upright position and burning fuel.

12. The smokeless firepit of claim 1, wherein: the top plate extends inwardly beyond the inner wall toward a center of the burn chamber; andthe top plate is configured to inwardly direct the secondary combustion air, preventing the secondary combustion air from immediately exiting the burn chamber.

13. The smokeless firepit of claim 1, wherein: the top plate extends inwardly beyond the inner wall and at least partially within the burn chamber defining a secondary combustion area within the burn chamber;the secondary combustion area is located adjacent to an underside of the top plate and the top of the inner wall; andthe top plate is configured to prevent the secondary combustion air from immediately exiting the burn chamber such that the secondary combustion air is forced to temporarily stay within the secondary combustion area adjacent to the underside of the top plate for igniting smoke and gases released by a previous primary combustion of the fuel within the burn chamber.

14. The smokeless firepit of claim 1, wherein: the top plate extends inwardly beyond the inner wall and at least partially within the burn chamber defining a secondary combustion area within the burn chamber;the top plate comprises an inner perimeter and an outer perimeter;the top plate comprises recesses in the inner perimeter; andeach recess of the top plate is configured to allow combusted matter therethrough.

15. The smokeless firepit of claim 1, wherein: the inner wall comprises a plurality of air outlets at the top of the inner wall; andthe plurality of air outlets of the inner wall is configured to allow the secondary combustion air to pass therethrough and enter the burn chamber below the top plate.

16. The smokeless firepit of claim 1, further comprising: a primary combustion air manifold located at the center of the second bottom;a shovel configured to remove combusted matter and comprising a shovel body and a handle extending upwardly from the shovel body;the handle has a height that is longer than the inner wall;the shovel body has a width that is less than a distance between the primary combustion air manifold and the inner wall; andthe handle extends at an angle from the shovel body of between 90 and 120 degrees.

17. The smokeless firepit of claim 1, wherein: the first bottom has a circular cross-section;the second bottom has a circular cross-section;the inner and outer walls each define annular walls; andthe top plate comprises a ring connecting the inner wall and the outer wall together.

18. The smokeless firepit of claim 1, further comprising: a support frame located between and connecting the first bottom and the second bottom;the support frame is configured to support the second bottom and space the second bottom from the first bottom; andthe support frame is configured to guide the primary combustion air from an outer perimeter of the first bottom to the center of the second bottom.

19. A firepit comprising: a first bottom comprising a plurality of air intakes configured to allow air therethrough;a second bottom elevated above the first bottom, the second bottom comprising a centrally located primary combustion air intake and secondary air intakes, the second bottom configured to divide the air into primary combustion air which passes through the primary combustion air intake and secondary combustion air which passes through the secondary air intakes;an outer wall extending upwardly from the first bottom;an inner wall extending upwardly from the second bottom, the inner wall and the second bottom defining a burn chamber for retaining and burning fuel therein, the inner wall being spaced inwardly of the outer wall which defines a secondary space between the outer and inner walls for the secondary combustion air to travel therethrough, and the inner wall comprising a plurality of secondary combustion air outlets located adjacent to a top end of the inner wall; anda top plate extending inwardly from the outer wall beyond the inner wall,wherein the secondary combustion air is configured to flow from the second bottom, through the secondary space, through the plurality of secondary combustion air outlets of the inner wall, and into the burn chamber underneath the top plate.

20. A method comprising: providing a firepit comprising a first bottom comprising a plurality of air intakes, a second bottom connected to and elevated above the first bottom, the second bottom comprising a centrally located primary combustion air intake and secondary air intakes, an outer wall extending upwardly from the first bottom, an inner wall extending upwardly from the second bottom, the inner wall and the second bottom defining a burn chamber for retaining and burning fuel therein, the inner wall being spaced inwardly of the outer wall which defines a secondary space between the outer and inner walls for the secondary combustion air to travel therethrough, and the inner wall comprising a plurality of secondary combustion air outlets located adjacent to a top end of the inner wall, and a top plate connecting the inner wall and the outer wall;initiating a primary combustion of the fuel in the burn chamber;intaking air, by the first bottom, through the plurality of air intakes in the first bottom;dividing the air, via the second bottom, into primary combustion air which passes through the primary combustion air intake and secondary combustion air which passes through the secondary air intakes;preheating, by heat emanating from the second bottom, the primary combustion air;guiding, by the second bottom, the primary combustion air into the burn chamber;guiding, by the second bottom, the secondary combustion air into the secondary space between the outer and inner walls;preheating, by heat emanating from the inner wall, the secondary combustion air which passes through the secondary space;guiding, by the outer and inner walls and the top plate, the secondary combustion air through the secondary space and toward the plurality of secondary combustion air outlets of the inner wall;guiding, by the plurality of secondary combustion air outlets of the inner wall, the secondary combustion air from the secondary space into the burn chamber underneath the top plate; andinitiating a secondary combustion by introducing the secondary combustion air into the burn chamber and burning smoke and gases released by the primary combustion of the fuel to reduce smoke outputted by the firepit.