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E. Air Shutter Setting
Air shutter settings should be adjusted by a qualified ser-
vice technician at the time of installation. The air shutter is
set at the factory for minimum vertical vent run. Adjust air
shutter for longer vertical runs. See Figure 9.1.
• Loosen the wing nut.
• Move the air handle to the right to open the air shutter.
• Move the air handle to the left to close the air shutter.
• Tighten the wing nut.
NOTICE: If sooting occurs, provide more air by opening
the air shutter.
Figure 9.1 Air Shutter
Air Shutter Settings
CNXT4236
CNXT4842
AIR SHUTTER WING NUT
NG
Propane
5/8 in.
Fully Open
5/8 in.
1/2 in.
Heatilator • CNXT4236IFT, CNXT4842IFT Installation Manual • 2515-980 Rev. R • 1/23
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