BB-E-2879A
assembly design shall permit the operator to remove the extinguisher by lifting the cylinder not
greater than ½ inch away from the bracket base and then away from the bracket.
3.4.3 Discharge or burst disk indicator. The fire extinguisher shall be equipped with a visual
device to notify the user of burst disk rupture or discharge. This indicator shall be securely
fastened to the extinguisher and not be susceptible to accidental activation or discharge. The
indicator shall be a different color than the other extinguisher components.
3.5 Cylinder retention and fragmentation resistance. Every cylinder shall remain unshattered
and in one piece, and every bracket shall retain the cylinder, when tested in accordance with 4.5.2.
3.6 Crash retention. The bracket shall retain the extinguisher under the loading conditions
specified in the test method of 4.5.3.
3.7 Performance.
3.7.1 Operation. The fire extinguisher shall be able to be removed from its bracket, have its
safety pin removed, and be operated while the user is wearing heavy gloves or arctic mittens.
3.7.2 Discharge range. The extinguisher shall be able to discharge its contents from any
orientation ranging from 80° to -80° from the vertical position. The discharge range shall be not
less than 4 feet for the entire time the extinguisher is discharging.
3.7.3 Discharge time. The discharge time for expelling the contents of the extinguisher shall
be not less than 8 seconds nor greater than 30 seconds at 68° ±3 °F.
3.7.4 Extinguishment. Two successive extinguishments are required during the 70 °F
extinguishing tests referenced in UL154 and UL711. No greater than five extinguishing attempts
shall be allowed to demonstrate the two successive extinguishments. The pan size for the
extinguishing test, after exposure to rough usage and during low temperature extinguishing, shall
be not less than 2 square feet.
3.7.5 Performance rating. The fire extinguisher shall have a performance rating of 2-B/C
class, in accordance with UL711.
3.7.6 Climatic extremes. The fire extinguisher shall perform at temperatures between
-40° and +120 °F. In addition, the fire extinguisher shall meet the performance requirements of
3.7 after the fire extinguisher has been subjected to the following conditions:
a. Exposure to temperatures of -65° ±3 °F for not less than 16 hours
b. Exposure to temperatures of +175° ±3 °F for not less than 4 hours.
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