TM-9-2350-311-10 M109 Operator's Manual for M109A2, M109A3, M109A4 and M109A5 Download
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TM 9–2350–311–10 2–256 Change 3 2–17 OPERATING AUXILIARY EQUIPMENT — CONTINUED 2–17.3 Ventilation Blower Operating Procedures 1 Turn MASTER switch (1) to ON. 2 To pull in fresh air, pull down air duct control handle (2) in driver’s compartment. Turn VENTILATOR BLOWER INTAKE switch (3) to INTAKE. 3 To clear out smoke, pull down on air duct control handle (2) and turn VENTILATOR BLOWER INTAKE switch (3) to EXHAUST. 1 2 3