11
Installation Clearances
Chapter3.–SafetyRequirements
Description
US Direct Vent
Installations 1
Canadian Direct Vent
Installations 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 12 in (30 cm) 36 in (91 cm)
C Clearance to permanently closed window * *
D
Vertical clearance to ventilated soft located above the terminal within
a horizontal distance of 2 feet from the center line of the terminal
* *
E Clearance to unventilated soft * *
F Clearance to outside corner * *
G Clearance to inside corner * *
H
Clearance to each side of center line extended above meter/regulator
assembly
*
3 ft (91 cm) within a
height 15 ft above the
meter/regulator assembly
I Clearance to service regulator vent outlet * 3 ft (91 cm)
J
Clearance to non-mechanical air supply inlet to building or the combus-
tion air inlet to any other appliance
12 in (30 cm) 36 in (91 cm)
K Clearance to a mechanical air supply inlet
3 ft (91 cm) above if
within 10 ft (3 m) hori-
zontally
6 ft (1.83 m)
L
Clearance above paved sidewalk or paved driveway located on public
property
* 7 ft (2.13 m)
†
M Clearance under veranda, porch, deck, or balcony * 12 in (30 cm)
‡
Clearance Requirements from Vent Terminations to Building Openings
<When supplying combustion air from the outdoors (Direct Vent)>
1 In accordance with the current ANSI Z223.1 / NFPA 54 National Fuel Gas Code.
2 In accordance with the current CSA B149.1 Natural Gas and Propane Installation 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 oor.
* Clearance in accordance with local installation codes and the requirements of the gas supplier. Clearance to opposite wall is 24 inches (60 cm).
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