Installation, Operation & Maintenance Manual
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Data subject to change
8.4 Combustion Air / Venting
Vent Clearances
Figure 23
L
L
E
D
B
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V
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V
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X
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V
V
B
V
J
J
X
X
B
B
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B
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OPERABLE
FIXED
CLOSED
VENT TERMINAL
AIR SUPPLY
AREA WHERE TERMINAL IS NOT PERMITTED
FIXED
CLOSED
Direct Vent Terminal Clearances
Direct Vent Terminal Clearances
Canadian Installations ¹,³
US Installation ²,³
A. Clearance above grade, veranda, porch, deck, or balcony 12" (30.5 cm)
12" (30.5 cm)
B. Clearance to window or door that may be opened
12" (30.5 cm) for models <100,000 BTUH (30 kW),
36" (91 cm) for models >100,000 BTUH (30 kW)
Two-pipe (direct vent) applications: 9" (23 cm) for models
<50,000 BTUH (15 kW), 12" (30.5 cm) for models >50,000
BTUH (15 kW). ††
Single-pipe applications: 4 feet (1.2 m)
C. Clearance to permanently closed window
12" (30.5 cm)
12" (30.5 cm)
D. Vertical clearance to ventilated sof
fi
t located above the
terminal within a horizontal distance of 2 feet (61 cm) from
the center line of the terminal
12" (30.5 cm) or in accordance with local installation
codes and the requirements of the gas supplier
12" (30.5 cm) or in accordance with local installation
codes and the requirements of the gas supplier
E. Clearance to unventilated sof
fi
t
12" (30.5 cm) or in accordance with local installation codes and
the requirements of the gas supplier
12" (30.5 cm) or in accordance with local installation.
codes and the requirements of the gas supplier
F. Clearance to outside corner
12" (30.5 cm) or in accordance with local installation codes and
the requirements of the gas supplier
12" (30.5 cm) or in accordance with local installation
codes and the requirements of the gas supplier
G. Clearance to inside corner
36" (91.4 cm)
36" (91.4 cm)
H. Clearance to each side of center line extended above
meter/regulator assembly
Above a meter/regulator assembly within 36" (91.4 cm)
horizontally of the vertical center-line of the regulator vent outlet to
a maximum vertical distance of 15 feet (4.5 m) above the meter/
regulator assembly
Above a meter/regulator assembly within 36" (91.4 cm)
horizontally of the vertical center-line of the regulator vent outlet to
a maximum vertical distance of 15 feet (4.5 m) above the meter/
regulator assembly
I. Clearance to service regulator vent outlet
36" (91.4 cm)
36" (91.4 cm) or in accordance with local installation codes
and the requirements of the gas supplier
J. Clearance to nonmechanical air supply inlet to building or
the combustion air inlet to any other appliance
12" (30.5 cm) for models <100,000 BTUH (30 kW),
36" (91.4 cm) for models >100,000 BTUH (30 kW).
Two-pipe (direct vent) applications: 9" (23 cm) for models
<50,000 BTUH (15 kW), 12" (30.5 cm) for models >50,000
BTUH (15 kW)
Single-pipe applications: 4 feet (1.2 m)
K. Clearance to a mechanical supply inlet
6 feet (1.83 m)
3 feet (91.4 cm) above if within 10 feet (3 m) horizontally
L. Clearance above paved sidewalk or paved driveway
located on public property
7 feet (2.13 m)†
7 feet (2.13 m) or in accordance with local installation codes and
the requirements of the gas supplier.
M. Clearance under veranda, porch, deck, or balcony
12" (30.5 cm)‡
12" (30.5 cm) or in accordance with local installation
codes and the requirements of the gas supplier
Table 9
Direct Vent Terminal Clearances
1. In accordance with the current CSA B149.1-00, Natural Gas and Propane Installation Code.
2. In accordance with the current ANSI Z223.1 / NFPA 54, National Gas Code.
3. In accordance with the current ANSI Z21.47 * CSA 2.3 American National Standard.
† A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single
family dwellings and serves both dwellings.
†† 12” (30.5 cm) up from the bottom edge of the structure for Two- pipe (direct vent) applications per ANSI
Z223.1 / NFPA 54, Nat ional Gas Code.
‡ Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the
fl
oor
and the distance between the top of the vent termination and the underside of the veranda, porch, or deck is
greater than 12” (30.5 cm) as speci
fi
ed in CSA B149.1-00.
A vent shall not terminate less than 12” (30.5 cm) above a grade level.
Any fresh air or make up inlet for dryer or fu rnace area is considered to be forced air inlet.
Avoid areas where condensate dri ppage may cause problems such as above planters, patios, or adjacent to
windows where steam may cause fogging.
A terminus of a vent shall be
fi
tted with a cap in accordance wit h the vent manufacturer’s installation
instructions, or in acc ordance with the installation instructions for a special venting system.
Responsibility for the provision of proper adequate venting and air supply for application shall rest with the
installer.
Vent shall extend high enough above building, or a neighboring obstruction, so that wind from any direction will
not create a positive pressure in the vicinity of the vent.
