6 720 680 223
12
Installation instructions
Required direct vent terminal clearances (twin pipe / concentric penetration)
Fig. 11
*
For clearances not specified in ANSI Z223.1 / NFPA 54 or CSA-B149.1, one of the following shall be indicated:
a) A minimum clearance value determined by testing in accordance with section 2.20, or;
b) A reference to the following footnote:
“Clearance in accordance with local installation codes and the requirements of the gas supplier.”
6720608836-23.1Av
Canadian installations
1)
U.S. installations
2)
A
Clearance above grade, veranda, porch, deck or balcony
12 in.
12 in.
B
Clearance to window or door that may be opened
36 in.
12 in.
C
Clearance to permanently closed window
*
*
D
Vertical clearance to ventilated soffit located above the vent
terminator within a horizontal distance of 2 feet (61cm) from the
center line of the terminator
*
*
E
Clearance to unventilated soffit
*
*
F
Clearance to outside corner
*
*
G
Clearance to inside corner
*
*
H
Clearance to each side of center line extended above meter/
regulator assembly
36 in. within a height 15 feet above
meter/ regulator assembly
*
I
Clearance to service regulator vent outlet
36 in.
*
J
Clearance to non-mechanical air supply inlet to building or the
combustion air inlet to any other application
36 in.
12 in.
K
Clearance to mechanical air supply inlet
72 in.
36 in. above if within 10 feet
horizontally
L
Clearance above paved sidewalk or paved driveway located on
public property
84 in.
3)
*
M
Clearance under veranda, porch deck or balcony
12 in.
4)
*
Table 7
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
3)
A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves both dwellings.
4)
Permitted only if veranda, porch, deck or balcony is fully open on a minimum of two sides beneath the floor.
