9
W415-0771 / B / 08.10.09
4.0 CLEARANCE TO COMBUSTIBLES
Minimum clearance to combustibles walls or panels from the
furnace assembly must be;
A = 12” (30 cm)
B = 12” (30 cm)
C = 12” (30 cm)
D = 48” (76 cm)
However, for easy access around the furnace and hopper, we
recommend B, C to be 24” wide to walk around and service.
Clearance from top of plenum/ horizontal duct to ceiling is
minimum 6” (15 cm) for the fi rst 4 feet of ducting away from the
furnace. Ducting runs greater than 4 feet from the unit can have
clearance to ceilings reduced to 1 inch.
Flue exhaust pipe should continue as 6” up to the point it
connects to chimney. Chimney diameter to be 6” or larger, if
possible.
Floor must be non-combustible (concrete, tile, etc.).
Plenum
Horizontal
Duct
4 feet
6 Inches
1
Inch
Ceiling
!
WARNING
Install vent at clearances specifi ed by the vent manufacturer.
Observe clearance to combustibles between plenum / horizontal duct run and ceiling. Minimum clear-
ance between top of plenum / top of duct for a distance or 4 ft away from plenum is 6”. Duct work
greater than 4 ft from plenum can have clearances to ceiling reduced to 1”
WALL
DOOR
WA
L
L
WALL
B
A
C
D
FURNACE PLACEMENT
TOP VIEW
WA
L
L
