Installing the Water Heater 31
Ref Description
Canadian Non-Direct Vent
Installations
1
US Non-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 36 in (91 cm)
48 in (120 cm) below or to side
of opening; 12 in (30 cm) above
opening
C Clearance to permanently closed window * *
D
Vertical clearance to ventilated soffit located above the
terminal within a horizontal distance of 2 ft (61 cm) from
the center line of the terminal
**
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 (91 cm) within a height
15 ft (4.57 m) above the meter/
regulator assembly
*
I Clearance to service regulator vent outlet 36 in (91 cm) *
J
Clearance to nonmechanical air supply inlet to building or
the combustion air inlet to any other appliance
36 in (91 cm)
48 in (120 cm) below or to side
of opening; 12 in (30 cm) above
opening
K Clearance to a mechanical air supply inlet 6 ft (1.83 m)
36 in (91 cm) above if within 10 ft
(3 m) horizontally
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) ‡ *
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
† 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 floor.
* Clearance in accordance with local installation codes and the requirements of the gas supplier.
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