TM-9-2540-207-14&P Sustainment Manual for A20 Heater for M113 2540-01-396-2826 Download
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TM 9-2540-207-14&P 2-5 /2-6 Blank 2.7 Heat Outlet Connection A ventilation air duct should be 7.94 to 8.23" inside diameter and rated for continuous operation at 350°F. Fasten four (4) #10-32 UNF bolts (supplied with vehicle ducting) into the Heater Ventilation Air Outlet. Figure 2.7-1. Ventilation Air Duct Note: The duct should seat properly with the Vent Outlet Seal. Some resistance may be felt as the duct compresses the seal. Note: The Vent Outlet Seal MUST be replaced EVERY time the heater is re- installed into a vent ducting system.