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Installation Instructions
Singular Combi Boiler - BTC 439003301 B (2021/07)
A
G
FIXED
CLOSED
FIXED
CLOSED
INSIDE
CORNER DE
TAIL
OPERABLE
OPERABL
E
B
F
C
B
B
L
D
E
B
I
H
M
K
B
B
A
J
VENT TERMINAL
AIR SUPPLY INLET
AREA WHERE TERMINAL IS NOT PERMITTED
Figure 29
Canadian Direct Vent Installations
¹
)
U.S. Direct Vent Installation
²
)
A
Clearance above grade, veranda, porch, deck or balcony
12 in. (30 cm)
12 in. (30 cm)
B
Clearance to window or door that may be opened
36 in. (91 cm)
12 in. (30 cm)
C
Clearance to permanently closed window
*
*
D
Vertical clearance to ventilated soffi t located above the vent termination within a
horizontal distance of 2 feet (61cm) from the center line of the termination
*
*
E
Clearance to unventilated soffi t
*
*
F
Clearance to outside corner
*
*
G
Clearance to inside corner
*
*
H
Clearance to each side of center line extended above gas meter/gas regulator
assembly
36 in. (91 cm) within a height 15 feet
above meter/regulator assembly
*
I
Clearance to service gas regulator vent outlet
36 in. (91 cm)
*
J
Clearance to non-mechanical air supply inlet to building or the combustion air
inlet to any other application
36 in. (91 cm)
12 in. (30 cm)
K
Clearance to mechanical air supply inlet
72 in. (182 cm)
36 in. (91 cm) above if within 10 feet
horizontally
L
Clearance above paved sidewalk or paved driveway located on public property
84 in. (213 cm)
³
)
*
M
Clearance under veranda, porch deck or balcony
12 in. (30 cm)
⁴
)
*
Table 9
Direct Venting
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
fl oor.
[*] For clearances not specifi ed in ANSI Z223.1 / NFPA 54 or CSAB149.1, 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.”
