eta SH Installation Manual page 30

Air valves for log boilers with pellet flange
Push air valve shafts into boiler
Push both air valve shafts into the air boxes from
the side on which the TWIN will be installed later.
Position air valves
Turn both air valves to the closed position.
Replace air valves
Push the air valves, springs and washers onto the
air valve shafts.
Both air valves must be installed in the closed
position on both sides.
Install cotter pins on air valve shafts
Install cotter pins on the air valve shafts so that the
air valves are pressed against the air boxes by the
springs.
The air valves must be completely flush with the air
boxes on both sides of the boiler.
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Installation