60 Venting for Combustion Air
Terminal Clearances for Non-Direct Vent Installations
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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
0 in (0 cm)
5
0 in (0 cm)
5
D
Vertical clearance to ventilated soffit located above
the terminal within a horizontal distance of 2 feet
(61 cm) from the center line of the terminal
Equal or greater than
soffit depth
4, 5
Equal or greater than
soffit depth
4, 5
E
Clearance to unventilated soffit
Equal or greater than
soffit depth
4, 5
Equal or greater than
soffit depth
4, 5
F
Clearance to outside corner
2 ft (61 cm)*
2 ft (61 cm)*
G Clearance to inside corner
12 in (30 cm)*
12 in (30 cm)*
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
3 ft (91 cm) within a
height of 15 ft (4.6 m)*
I
Clearance to service regulator vent outlet
36 in (91 cm)
3 ft (91 cm)*
J
Clearance to non-mechanical 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)
†
7 ft (2.13 m)
†
M Clearance under veranda, porch deck, or balcony
12 in (30 cm)
‡
12 in (30 cm) - open on
3 sides*
* Suggested clearances by the manufacturer. If the clearances required by local codes are different from those from the table above,
the greater clearance should apply.
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 If locally adopted installation codes specify clearances different than those illustrated, then the most stringent clearance shall prevail.
4 Soffit with 12” depth requires a minimum of 12” vertical clearance from the termination (36” soffit requires a minimum of 36”
vertical clearance)
5 In the areas where corrosion and discoloration of building materials can occur, a minimum clearance of 12” shall apply.
