Hitachi NT 65GB Technical Data And Service Manual page 16

(4) Discharge and cooling
When you stop pressing Pushing
Lever (A) [82], the Chamber [16] is
placed in its initial state and the
sealing by Piston Ring (B) [17] is
released. When the Fan [11] rotates,
air passes through the Filter Mesh [2],
enters the combustion chamber, and
is then discharged outside, in order to
discharge gas
combustion chamber (Fig. 8).
Chamber [16]
and cool the
Piston
Ring (B) [17]
Pushing
Lever (A) [82]
-13-
Filter Mesh [2]
Fig. 8
Fan [11]