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Installation Instructions
Singular Combi Boiler - BTC 439003301 B (2021/07)
FIXED
CLOSED
FIXED
CL
OSED
INSIDE
CORNER DETAIL
OPERABLE
OPERABLE
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.”
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