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9.7.2. MINIMUM CLEARANCES TO COMBUSTIBLES MATERIALS FOR AIR RETURN DUCT
The return air duct should be at least equal in size to the return air plenum. The air return duct can be installed at zero
clearance to combustibles.
9.7.3. MINIMUM CLEARANCES TO COMBUSTIBLES MATERIALS FOR HOT AIR PLENUM
Plenums installed on the furnace must be made of metal in accordance with CSA B365 or NFPA 90B. The hot air duct
can be passed through the side wall with a clearance of six (6) inches around thereof.
9.7.4. FLOOR PROTECTION
If the floor is made of non combustible material, no
floor protector is required.
If the floor is made of combustible material, a non
combustible material floor protector is required (see
table below).
A
B
C
D
E
*Steel with a minimum thickness of 0.015" (0.38 mm) or ceramic tiles sealed together with grout. No protection is required if the unit
is installed on a non-combustible floor (ex: concrete).
Note 1: The floor protection at the back of the furnace is limited to the furnace's required clearance (A) if such clearance is smaller
than 8 inches (203 mm).
Note 2: Only required under the horizontal section of the connector. Must exceed each side of the connector pipe by at least 2
inches (51 mm).
FLOOR PROTECTION*
CANADA
18" (457 mm)
From door opening
N/A (USA only)
8" (203 mm)
8" (203 mm) – Note 1
N/A (USA only)
USA
16" (406 mm)
From door opening
8" (203 mm)
From door opening
N/A (Canada only)
N/A (Canada only)
Note 2
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