506305-01 Page 9 of 36Issue 0938
Figure 5
Sidewall Vent Terminal Clearances (Direct Vented Furnaces)
1
In accordance with the current CSA B149.1, Natural Gas and
Propane Installation Code
2
In accordance with the current ANSI Z223.1/NFPA 54, National
Fuel Gas Code
†
A vent shall not terminate directly above a sidewalk or paved
driveway that is located between two single family dwellings and
serves both dwellings.
‡
Permitted only if veranda, porch, deck, or balcony is fully open on a
minimum of two sides beneath the floor.
* For clearances not specified in ANSI Z223.1/NFPA 54 or CSA
B149.1, the following statement shall be included:
“Clearance in accordance with local installation codes and the
requirements of the gas supplier and the manufacturer’s installation
instructions.”
V
X
Vent Terminal
Air Supply Inlet
Area Where Terminal Is
Not Permitted
A ** Minimum 12” (30 cm) above grade or
12” (30 cm) above average snow accumulation.
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