Patent Grant
10507343
This patent application is directed to fire protection systems and devices and, more specifically, to low pressure drop acoustic suppressor nozzles for inert gas discharge systems.
Inert gas fire suppression systems are often used to protect equipment that can get damaged by use of traditional suppression systems that use water, foams and powders. For example, inert gas fire suppression systems can be used to protect electronic equipment such as, e.g., personal computers, servers, equipment found in large data storage centers, and network switches to name just a few. A typical fire suppression system includes a high pressure inert gas source that is connected to one or more inert gas discharge nozzles via piping. A given fire suppression nozzle has an effective protection height and a maximum coverage area, i.e., the area in which the nozzle is effective in suppressing a fire. Depending on the area of coverage, one or more of the nozzles are installed in an enclosed space to protect the enclosure. In case of a fire, a detector triggers the system and a control valve is opened to send high pressure inert gas to the nozzles. Depending on the system, the high pressure source can be connected to more than one enclosure, through pipe network ending in multiple nozzles, and the flow to each enclosure is individually controlled via respective control valves.
Industry regulations require that the fire suppression systems meet certain standards. For example, “NFPA 2001: Standard on Clean Agent Fire Extinguishing Systems,” 2015 Edition (hereinafter “NFPA 2001”), which is incorporated herein by reference in its entirety as background, provides the requirements for clean agent fire extinguishing systems. Section 5.8 of NFPA 2001 generally states that the nozzle needs to be designed for the intended use and selected based on the limitations concerning size of the enclosure, the floor coverage and alignment. Section 5.4.2 of NFPA 2001 requires that the method for flame extinguishment and the suppression agent concentration conform to ANSI/UL 2127, “Standard for Inert Gas Clean Agent Extinguishing System Units,” Second Edition (hereinafter “UL 2127”), which is incorporated herein by reference in its entirety as background. UL 2127 states that the extinguishing system must suppress the fire within 30 seconds after completion of agent discharge and provides requirements on the construction of the test enclosure and the locations in the enclosure for measuring the agent concentration. According to UL 2127, the test enclosure to be constructed must have the maximum area coverage for the extinguishing system or nozzle and the minimum and maximum protected area height limitations. Thus, each fire suppression nozzle that is compliant with UL 2127 is rated for a maximum area coverage and a minimum/maximum protection height.
In order for the fire suppression nozzle to provide the coverage area and protection height and reduce the oxygen content in the enclosure in compliance with UL 2127, a large amount of inert gas is discharged into the enclosed area in a short period of time. To accomplish this, typically, the inert gas suppression systems often discharge the inert gas at supersonic velocities. The supersonic velocities create significant turbulence, resulting in a high power broadband spectrum of sound. That is, the high velocity gas flowing from the inert gas discharge nozzles can result in very high levels of sound. However, certain electronic components with sensitive mechanical parts (e.g., hard disc drives) are susceptible to adverse effects from high levels of sound. The high sound levels can reduce the performance of these components, and in some cases, the components may stop functioning altogether. Although the computer equipment can be shut down to protect the sound sensitive components, in many cases, if the enclosure houses critical computer systems where downtime is unacceptable due to, e.g., economic or safety reasons, the computer equipment is kept operational even while the nozzle discharges the inert gas. Thus, while electronic equipment in an enclosure may be unaffected by the fire itself, the equipment can still experience damage and thus downtime due to the high sound levels from the inert gas discharge.
Previous attempts in the industry to reduce the high levels of sound associated with the high velocity/high pressure gas discharge have primarily dealt with restricting the flow rate of gas into the enclosed area. For example, previous designs have included blocking the flow inside the nozzle using sound absorbing materials. However, to effectively reduce the sound level of the gas to an acceptable range, e.g., to levels that prevent hard disk failures, the flow rate needs to be significantly reduced, which typically means a high pressure drop in the nozzle. The resulting reduction in the flow rate prevents the gas from being discharged fast enough to quickly reduce the oxygen level and meet current fire suppression standards. Thus, previous attempts to reduce the sound output of the fire suppression nozzles have resulted in a decreased effective coverage for the nozzle. That is, in an attempt to produce a reduced-sound nozzle, the related art nozzles have decreased the maximum coverage area and/or the maximum protection height. Accordingly, a greater number of the related art reduced-sound nozzles may be needed in order to have the same coverage area as existing fire suppression nozzles. In addition, because the coverage area is less, the related art reduced-sound nozzles cannot directly replace, i.e., retrofit, existing fire suppression nozzles that have already been installed in enclosures without substantial modifications to the system, e.g., by running new piping to install additional nozzles.
Accordingly, there is a need for fire suppression nozzles that can quickly discharge gases and reduce the sound generated during discharge to acceptable levels for electronic equipment. In addition, there is also a need to retrofit existing fire suppression nozzles with reduced-sound nozzles without substantial modifications to the existing systems. Further limitations and disadvantages of conventional approaches to inert gas nozzle configurations will become apparent to one skilled in the art through comparison of such approaches with embodiments of the present invention as set forth in the remainder of the present disclosure with reference to the drawings.
Embodiments of the present invention are directed to low pressure drop acoustic suppressor nozzles for use in fire protection systems. The disclosed low pressure drop acoustic suppressor nozzles are particularly suitable for use in fire protection systems. For example, preferred embodiments of the low pressure drop acoustic suppressor nozzle are suitable for fire protection systems that protect sound sensitive equipment, such as, e.g., computers. The nozzles are directed to reducing sound associated with gas flow and have a sound power that is preferably no greater than 130 dB, more preferably no greater than 125 dB and even more preferably no greater than 108.6 dB. “Sound power” as used herein means the sound level generated by the nozzle. Typically, when the sound level is provided for fire suppression nozzles, it is sound level that has been measured at a known distance from the nozzle. However, such sound measurement readings can be misleading with respect to the actual sound level generated by the nozzle, because the measured sound level can be affected by the characteristics of the enclosure and for other reasons. For example, measurement of sound at a given one location can be inaccurate due to potential sound absorption impact from the enclosure construction, distance from the nozzle, and/or obstructions between the nozzle and the measurement location, which may not be disclosed or accounted for in the reported sound measurement reading. Thus, the measured sound level may not accurately describe the actual sound level generated by the nozzle. The calculation of the sound power level of an object is routine for those skilled in the art and thus will not be discussed herein.
Preferred embodiments of the nozzles discussed herein include nozzles tested in compliance with UL 2127. The sound power values, frequency values, pressure values, coverage values and physical dimensions associated with various preferred embodiments are given in nominal values. These nominal values include a range of commercially acceptable values around the nominal. For example, sound power values can range ±5%, frequency values can range ±10%, pressure values can range ±5%, coverage values (e.g., area and height) can range ±5%, flow values can range ±10%, and the values for physical dimensions can range ±10% around the nominal value.
Preferred embodiments of the nozzles disclosed herein are configured such that gas exiting a plurality of outlet holes is balanced such that a ratio between a maximum flow value in the plurality of outlet holes and a minimum flow value in the plurality of outlet holes is less than 70:30, and more preferably 60:40 and even more preferably substantially equal. Preferably, the nozzle is configured such that the plurality of outlet holes are grouped into two or more sets of outlet holes having balanced flow between the sets, and a ratio between a maximum set flow value and a minimum set flow value in the two or more sets of outlet holes is less than 70:30, and more preferably 60:40 and even more preferably substantially equal. Preferably, the plurality of outlet holes are disposed along a longitudinal axis of a chamber of the nozzle, and the nozzle is configured to provide the balanced flow regardless of the orientation and configuration of the plurality of outlet holes along the longitudinal axis. In some preferred embodiments, the nozzle directs inert gas flow in a passageway in a direction transverse to the inert gas flow in the passageway and then divide the transverse inert gas flow into two or more balanced gas flow portions that each flow between opposed sound absorbing surfaces, respectively. Preferably, a ratio between the maximum flow value and the minimum flow value in the two or more balanced gas flow portions is less than 70:30, and more preferably, less than 60:40, and even more preferably, the two balanced gas flow portions are substantially equal.
In an exemplary embodiment, a nozzle includes a longitudinally extending inner conduit having an inlet and a plurality of primary outlets formed transversely through a sidewall of the inner conduit. In some embodiments, the longitudinally extending inner conduit can be a cylindrical tube or pipe. The nozzle also includes an outer conduit that is disposed around the primary outlets, e.g., the outer conduit is disposed such that the outer conduit circumscribes the inner conduit. In some embodiments, the outer conduit can be a cylindrical tube or pipe. Preferably, the outer conduit includes first and second sets of secondary outlets formed transversely through a sidewall of the outer conduit. The first set of secondary outlets is disposed such that they are longitudinally offset, e.g., axially offset, from the primary outlets in a first direction and the second set of secondary outlets is disposed such that they are longitudinally offset, e.g., axially offset, from the primary outlets in a second direction that is opposite the first direction. The nozzle includes an inner annular disc circumscribing the outer tube between the first and second sets of radially facing secondary outlets and has sound absorbing material disposed on each respective side of the inner annular disk facing the first and second sets of radially facing secondary outlets. The nozzle also includes a first outer annular disc disposed on an opposite side of the first set of radially facing secondary outlets than the inner annular disc. The first outer annular disc has sound absorbing material disposed on a side facing the first set of radially facing secondary outlets. A second outer annular disc is disposed on an opposite side of the second set of radially facing secondary outlets than the inner annular disc. The second outer annular disc has sound absorbing material disposed on a side facing the second set of radially facing secondary outlets.
Preferably, the nozzle receives inert gas flow from a flow restricting device. Preferably, the flow restricting device is an orifice plate with an orifice. Preferably, the configuration of the flow restricting device, e.g., an orifice plate, is based on suppression system size and flow distribution requirements for an enclosure. In some embodiments, the flow restricting device is mounted remotely and upstream of the inlet of the inner conduit. In other embodiments, the flow restricting device is disposed at the inlet of the inner conduit. In some embodiments, the nozzle includes a sound absorbing device that is disposed in a chamber formed by the outer surface of the inner conduit and an inner surface of the outer conduit. In some exemplary embodiments, the sound absorbing device includes a baffle. Preferably, the baffle includes porous sound absorbing porous material such as, e.g., stainless steel wool sandwiched between wire mesh, stainless steel wool between inner and outer wire cloth, perforated metals or metal foam to name just a few. In some exemplary embodiments, the sound absorbing device includes a non-porous ring that is disposed in the chamber between the first and second sets of secondary outlets.
Another exemplary embodiment is directed to a method of reducing sound that includes restricting a flow of inert gas to a nozzle. In some embodiments, the restriction of the flow is performed remotely from the nozzle. In other exemplary embodiments, the restricting is performed at the inlet to the nozzle. The restricted inert gas flow is then introduced into a passageway of the nozzle. In some embodiments, the restricting of the flow is accomplished by using an orifice plate. In some embodiments, the method also includes directing the inert gas flow at or through a sound absorbing device in the nozzle. In some embodiments, the flow is directed through a porous sound absorbing device that includes a baffle with sound absorbing porous material such as, e.g., stainless steel wool sandwiched between wire mesh, stainless steel wool between inner and outer wire cloth, perforated metals and metal foam to name just a few. In some embodiments, the method also includes directing the inert gas flow at a non-porous sound absorbing device that can include a ring or rings that includes sound absorbing porous material such as, e.g., fiberglass or mineral wool. The method further includes dividing the inert gas fluid flow into two or more gas flow portions in an outlet path of the nozzle. Preferably, the inert gas exits out of the nozzle in a balanced manner.
In operation, in preferred embodiments, a flow of inert gas from the storage tanks is sent through an orifice plate that restricts the flow and pressure. In some embodiments, the orifice plate can be mounted remotely from the nozzle. In other embodiments, the orifice plate is mounted at the inlet to the nozzle. The inert gas flow then enters an axially extending passageway in the nozzle. The flow exits out of the passageway through a plurality of outlets that are disposed through a sidewall of the passageway and into an annular chamber. Preferably, the flow exits out of the plurality of outlets in a balanced manner such that the O2 content in each corner of the enclosure is reduced at approximately the same rate. In the annular chamber, in some embodiments, the flow is sent through a baffle that includes porous sound absorbing material. In some embodiments, the flow is directed at a sound absorbing ring or rings that includes non-porous sound absorbing material. In other embodiments, no baffle or ring is used. Preferably, the flow is diverted through first and second sets of radially facing secondary outlets on an outer sidewall of the annual chamber. The flow is then directed between sound absorbing discs as the inert gas flow exits out of the nozzle. The sound absorbing discs include an inner annular disc disposed between a pair of outer annular discs. The disclosed low pressure drop acoustic suppressor nozzle reduces the sound associated with the gas discharge to acceptable levels within the operating frequency range while providing a low pressure drop that allows rapid inert gas discharge for fire suppression.
Although exemplary embodiments, as discussed below, are directed to a configuration having two flow portions exiting the nozzle through respective sets of outlet holes, nozzle configurations having one set of outlet holes or more than two flow portions can provide sound power that is preferably no greater than 130 dB, more preferably no greater than 125 dB and even more preferably no greater than 108.6 dB so long as the flows exiting the outlet holes are balanced as discussed herein.
The accompanying drawings, which are incorporated herein and constitute part of this specification, illustrate exemplary embodiments of the invention, and, together with the general description given above and the detailed description given below, serve to explain the features of the invention. It should be understood that the preferred embodiments are some examples of the invention as provided by the appended claims.
Embodiments of the low pressure drop acoustic suppressor nozzle introduced herein may be better understood by referring to the following Detailed Description in conjunction with the accompanying drawings, in which like reference numerals indicate identical or functionally similar elements:
Exemplary embodiments of the present disclosure are directed to inert gas nozzles that suppress the sound from the nozzles to acceptable levels without the high pressure drop in the nozzle as found in prior art and related art systems. In the exemplary embodiments, the sound is reduced to acceptable levels by using only a minimal amount of sound dampening material in the flow path of the nozzle and by strategically disposing the nozzle relative to a pressure reducing device disposed upstream of the nozzle. For example, in some exemplary embodiments, the sound power level from the nozzle is no greater than 125 dB for a frequency range from 500 to 10,000 Hz for a coverage area up to 36 ft.×36 ft., and more preferably up to 32 ft.×32 ft. In some exemplary embodiments, the pressure reducing device is mounted remotely from the main nozzle. In other embodiment, the pressure reducing device is mounted at the inlet of the nozzle.
Generally, when the fire suppression system is activated, the inert gas pressure in the piping upstream of the pressure reducing device, such as, e.g., an orifice, can be as high as 2,000 psi. Depending on the configuration of the enclosure being protected, the pressure reducing device reduces the pressure to achieve the required inert gas flow for the enclosure. Of course, the nozzle also introduces a pressure drop that must be accounted for. If the pressure drop in the nozzle is too high, the inert gas flow will be unable to meet design criteria for displacing the oxygen in the enclosure. In exemplary embodiments of the disclosure, the disclosed low pressure drop nozzle has a pressure drop that is no more than 80 psi higher than the enclosure gage pressure. It is believed that there is no related art fire suppression nozzle that has such a low pressure drop (preferably no more than 80 psi higher than the enclosure gage pressure), low sound generation (preferably less than 125 dB and more preferably less than 108.6 dB) and high inert gas coverage area distribution (preferably up to 36 ft.×36 ft., and more preferably up to 32 ft.×32 ft.).
As shown in
As seen in
With reference to
Inner tube 126 includes a set of primary outlets 130 that includes a plurality of radially facing primary apertures 132. In other words, the radially facing primary apertures 132 extend transversely through the sidewall of the inner tube 126. In general, smaller diameter and larger number of apertures provide better sound dissipating characteristics. Preferably, the apertures 132 of the primary outlets 130 are arranged in six rows with thirty apertures 132 in each row. Each of the apertures 132 in the respective row can be on a same plane perpendicular to a longitudinal axis of the inner tube 126. The rows can be parallel to each other. Preferably, each row is offset from its adjacent row. In some embodiments, the offset is 6 degrees. However, in some embodiments, there is no offset. i.e., the apertures 132 are in-line as shown in
A plug 138 encloses the inner tube 126 to create an inner chamber corresponding to passageway 128. In some embodiments, the plug 138 can be secured in the inner tube with suitable threads, by welding, or with a press fit, for example. In some embodiments, the inner tube 126 is manufactured such that the end of the passageway 128 is already sealed and a plug 138 is not needed. For example, the tube 126 can be formed by starting with a cylindrical blank and drilling the passageway 128 to the correct depth, such that plug 138 is not needed. The inner tube 126 includes a flange 124 that is attached to the first outer annular disc 114 an appropriate attachment means such as, snap rings, retaining rings or some other fastening means. For example, as seen in
In some embodiments, a sound absorbing body 136 (see
Inner tube 126 is surrounded by an outer tube 134 defining an annular chamber 135 that surrounds the primary outlets 132. Preferably the outer tube 134 is a cylindrical tube or pipe, but outer tube 134 can have other shapes. The outer tube 134 includes first and second sets of secondary outlets 106 and 108, respectively. Preferably, the inner diameter d3 (see
In some embodiments, the apertures 110, 112 of the secondary outlets 106, 108, respectively, are arranged in four rows with thirty-six apertures 110, 112 in each row, respectively. Each of the apertures 110, 112 in the respective row can be on a same plane perpendicular to a longitudinal axis of the outer tube 134. The rows can be parallel to each other. Preferably, each row is offset from its adjacent row. In some embodiments, the offset is 5 degrees. However, in other embodiments, the respective apertures 110, 112 are in-line with each other. Preferably, each aperture 110, 112 is in a range of approximately ⅛ inch to ½ inch in diameter and more preferably ¼ inch in diameter. In some embodiments, all the apertures 110, 112 are the same diameter, respectively with each set of outlets 106, 108 or even between outlet sets 106, 108. In some embodiments, the apertures 110, 112 can have different diameters, respectively with each set of outlets 106, 108 and/or between outlet sets 106, 108. However, the diameter, number and arrangement of the apertures 110, 112 of the secondary outlets 106, 108, respectively, are not limiting and the inventive nozzle 100 can include a set of secondary outlets 106, 108 having other diameter, number, offset and arrangement configurations. For example, in other embodiments, the apertures 110, 112 are not arranged in parallel rows and the apertures 110, 112 can be arranged using other patterns or even randomly arranged. In addition, in some embodiments, geometries other than holes can be used such as slots so long as the combined flow area of the secondary outlets 106, 108 is appropriate for the application.
In some embodiments, the first and second sets of secondary outlets 106 and 108 have a combined flow area that is greater than the combined flow area of the primary outlet 130. Preferably, the first and second sets of secondary outlets 106, 108 have a combined flow area in a range of approximately 45 to 68 in2, and more preferably approximately 56.55 in2. In some embodiments, the primary outlets 130 are disposed on the sidewall of the inner tube 126 such that the flow exits between the secondary outlets 106, 108. Preferably, the flow exits equidistant between the secondary outlets 106, 108. In some embodiments, the flow path from the primary outlets 130 is split into two paths each directed to the respective secondary outlets 106, 108. In some embodiments, more than two secondary outlets are provided and the flow from the primary outlet is split into more than two paths.
Preferably, a sound absorbing device is disposed in the annular chamber 135. In some embodiments, as shown in
As seen in
The second outer annular ring 118 is comprised of a support plate 162 and a sound absorbing insert 164. The support plate 162 can be made of any appropriate material based on the temperature requirement of the application such as, e.g., metal, including aluminum, bronze and stainless steel, plastic, fiberglass and ceramic or composites thereof to name just a few. The sound absorbing insert 164 further reduces the sound level of the inert gas as it flows from the second set of secondary outlets 108 and into the enclosure. Preferably, the thickness of sound absorbing insert 164 is in a range of 0.25 inch to 1.00 inch and more preferably, 0.50 inch. The sound absorbing insert 164 can be any appropriate sound absorbing material such as, e.g., fiberglass and mineral wool to name just a few. The second outer annular disc 118 is attached to one end of the outer tube 134 with, e.g., a plurality of fasteners 168 or by some other means. First outer annular disc 114 includes a support plate 154 and a sound absorbing insert 156. The support plate 154 can be made of any appropriate material based on the temperature requirement of the application such as, e.g., metal, including aluminum, bronze and stainless steel, plastic, fiberglass and ceramic or composites thereof to name just a few. The sound absorbing insert 156 further reduces the sound level of the inert gas as it flows from the first set of secondary outlets 106 and into the enclosure. Preferably, the thickness of sound absorbing insert 156 is in a range of 0.25 inch to 1.0 inch and more preferably, 0.5 inch. The sound absorbing insert 156 can be any appropriate sound absorbing material such as, e.g., fiberglass and mineral wool to name just a few. The first outer annular disc 114 is attached to another end portion of the outer tube 134 with, e.g., a plurality of fasteners 160 or by some other means.
In another exemplary embodiment, as seen in
When the fire suppression system is operated, as seen in, e.g., the exemplary embodiment of
As shown in
Although the low pressure drop acoustic suppressor nozzle 100 is shown and described in the above exemplary embodiments as having cylindrical components, other suitable shapes can be used to construct the nozzle components. In addition, although the above exemplary embodiments were described with a sound absorbing device having a porous baffle 140, some embodiments of the sound absorbing device do not use a porous baffle. For example, in some embodiments, the sound absorbing device in the annual chamber 135 can include a non-porous material can be used to divert the flow of gas from primary outlets 130 to secondary outlets 106, 108. For example,
The exemplary embodiments discussed above are directed to a configuration having two flow portions exiting the nozzle through respective sets of outlet holes. However, exemplary embodiments of the nozzle are not limited to this configuration. In some embodiments, the nozzle can be configured with more than two sets of secondary outlet holes similar to outlets 106 and 108. In still other embodiments, the chamber 135 has one set of secondary outlet holes which are disposed along a longitudinal axis of chamber 135. Preferably, the exemplary nozzles are configured to provide balanced flow regardless of the orientation and configuration of the plurality of outlet holes along the longitudinal axis. For example, the nozzles are configured such that gas exiting a plurality of outlet holes is balanced such that a ratio between a maximum flow value in the plurality of outlet holes and a minimum flow value in the plurality of outlet holes is less than 70:30, and more preferably 60:40 and even more preferably substantially equal.
In the above exemplary embodiments, the sound power of nozzle 101 is no greater than 130 dB for a frequency range from 500 to 10,000 Hz for inert gas flow rates in a range of approximately 1,000 CFM to approximately 5,400 CFM while conforming to the standards in UL 2127. In some exemplary embodiments, the peak value of the sound power level of nozzle 101 is no greater than 130 dB, preferably no greater than 120 dB, and more preferably no greater than 111 dB, for a frequency range from 500 to 10,000 Hz for inert gas flow rates in a range of approximately 950 CFM to approximately 5,400 CFM while conforming to the standards in UL 2127. In some exemplary embodiments, the peak sound power level of nozzle 101 is in a range between 111 dB to 130 dB, for a frequency range from 500 to 10,000 Hz for inert gas flow rates in a range of approximately 950 CFM to approximately 5,400 CFM while conforming to the standards in UL 2127. For example,
As discussed above, hard disk drives are susceptible to sound, and a high sound level can lead to degradation or, in some cases, failure. The exemplary embodiments disclosed above reduce or minimize the probability of degradation or failure of the hard disk drives while conforming to the standards in UL 2127. For example, in some embodiments, the sound power from the acoustic nozzle 101 is no greater than 125 dB for a frequency range from 500 to 10,000 Hz for a coverage area up to 36 ft.×36 ft., and more preferably up to 32 ft.×32 ft., and more preferably, no greater than 120 dB. It is believed that there is no related art fire suppression nozzle meeting the UL 2127 standard generates a sound power level that is at 125 dB or less at any coverage area up to 36 ft.×36 ft., and more preferably up to 32 ft.×32 ft. In some exemplary embodiments, the acoustic nozzle 101 is no greater than 130 dB, and more preferably, no greater than 108.6 dB, for a frequency range from 500 to 10,000 Hz for a coverage area up to 36 ft.×36 ft., and more preferably up to 32 ft.×32 ft. In the above exemplary embodiments, the maximum protection height of the acoustic nozzle 101 is up to 20 ft.
While the present invention has been disclosed with reference to certain embodiments, numerous modifications, alterations, and changes to the described embodiments are possible without departing from the sphere and scope of the present invention, as defined in the appended claims. Accordingly, it is intended that the present invention not be limited to the described embodiments, but that it has the full scope defined by the language of the following claims, and equivalents thereof.
This application is a 35 U.S.C. § 371 application of International Application No. PCT/US2016/064753 filed Dec. 2, 2016, which claims the benefit of priority to U.S. Provisional Patent Application No. 62/263,300, filed Dec. 4, 2015 and U.S. Provisional Patent Application No. 62/379,017, filed Aug. 24, 2016, each of which is incorporated by reference in its entirety.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/US2016/064753 | 12/2/2016 | WO | 00 |
| Publishing Document | Publishing Date | Country | Kind |
|---|---|---|---|
| WO2017/096249 | 6/8/2017 | WO | A |
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| Entry |
|---|
| ANSI/UL 2127, “Standard for Inert Gas Clean Agent Extinguishing System Units,” Second Edition. |
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| Number | Date | Country | |
|---|---|---|---|
| 20180272166 A1 | Sep 2018 | US |
| Number | Date | Country | |
|---|---|---|---|
| 62379017 | Aug 2016 | US | |
| 62263300 | Dec 2015 | US |
