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COMMON SETUP
4" single wall pipe* (galvanized or
stainless steel) or 4" B-type vent*.
* Single wall vent pipe requires a 6" clearance to
combustibles. B-type vent (double wall) requires a 1"
clearance to combustibles. Use of B-type vent is not
permissible downstream outlet side of the fan motor.
Any additional vent pipe used between the fan motor
and the vent hood must be positive pressure rated with
all seams sealed to prevent leakage. Single wall
galvanized or stainless steel pipe is best.
F
E
IGURE
125B Model shown
Mount gas pressure
switch against wall
See Figure D, page 5 for location of Linear Spillage Switch
6
5" to 4" vent
reducer pipe
Vent Hood (see freeze prevention
information on page 2)
Power vent motor
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