Description
Canadian
Installations
1,2
1 2
US Installations
2,3
3
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) for
appliances >100,000 Btuh
(30 kW)
12 in (30 cm) for
appliances > 50,000 Btuh
(15 kW)
C Clearance to permanently
closed window
*
*
D Vertical clearance to
ventilated soffit located
above the terminal within a
horizontal distance of 2ft
(61 cm) from the center
line of the terminal
* *
E Clearance to unventilated
soffit
* *
F Clearance to outside
corner
* *
G Clearance to inside corner 4 ft (1.22 m) 4 ft (1.22 m)
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
Above a regulator within 3
ft (91 cm) horizontally of
the vertical center line of
the regulator vent outlet to
a maximum vertical
distance of 15 ft (4.5 m)
*
J Clearance to non-
mechanical air supply inlet
to building or the
combustion air inlet to any
other appliance
36 in (91 cm) for
appliances >100,000 Btuh
(30 kW)
12 in (30 cm) for
appliances > 50,000 Btuh
(15 kW)
1
In accordance with the current CAN/CSA-B149 Installation Codes.
2
If locally adopted installation codes specify clearances different than those illustrated, then the most stringent shall apply.
3
In accordance with the current ANSI Z223.1 / NFPA54 National Fuel Gas Code.
*
Clearances in accordance with local installation codes and the requirements of the gas supplier. The minimum distance from adjacent
public walkways, adjacent buildings, openable windows, and building openings shall not be less than those values specified in the National
Fuel Gas Code, ANSI Z223.1/NFPA 54, and/or the Natural Gas and Propane Installation Code, CSA 8149.1.
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