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APPENDIX A
TM 07661B-14/1
used at all times. The heater is only designed to maintain the temperature of the AFFF chemical agent above freezing in
temperatures to -40F. (-40C) When temperatures are expected to drop below -40 F, an auxiliary heater should be
installed. A plugged 1-inch opening is provided in the end of the AFFF tank to accept an immersion or dipstick-type
heater.
b. Operation in Extreme Heat or Desert Regions. The fire extinguisher is designed to operate effectively in any tropical
climate. Operational procedures should include supplying shade for the fire extinguisher and/or requiring personnel to
wear gloves as protection against hot metal surfaces. In desert regions, additional protection should be provided to
shield the fire extinguisher against blowing sand.
A 2-16
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