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D
E
L
A Clearance above grade, veranda, porch, deck, or balcony
B Clearance to window or door that may be opened
C Clearance to permanently closed window
Vertical clearance to ventilated soffit located above
D
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
Clearance to each side of center line extended above
H
meter/regulator assembly
I Clearance to service regulator vent outlet
Clearance to non-mechanical air supply inlet to
J
a building or the combustion air inlet to any other
appliance.
K Clearance to mechanical air supply inlet
Clearance above paved sidewalk or paved driveway
L
located on public property
M Clearance under veranda, porch deck, or balcony
*Clearance in accordance with local installation codes and the requirements of the gas supplier.
**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.
The vent for condensing water heaters shall not terminate:
• over public walkways; or
• near soffit vents or crawl space vents or other areas where condensate or vapor could create a nuisance or hazard or cause property damage; or
• where condensate vapor could cause damage or could be detrimental to the operation of regulators, relief valves, or other
equipment.
Notes:
1) In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code
2) If locally adopted installation codes specify clearances different than those illustrated, then the most stringent clearance shall prevail.
3) Blocking air supply and exhaust vent by snow may cause incomplete combustion and an appliance failure. Install the termination by
providing sufficient clearance from anticipated snow line in accordance with local code or manufacture's instructions and make sure
there in no blockage.
4) Provide an appropriate clearance between a vent termination and a building to prevent degradation to building materials caused by
flue gases.
5) Water heaters installed outdoors follow the Other Than Direct Vent clearances.
-Vent termination clearances-
Inside
corner detail
A
B
C
Operable
Fixed
closed
B
Operable
B
A
B
3 ft (91 cm) above if within
10 ft (3 m) horizontally.
7 ft (213 cm)
1 ft (30 cm)***
14
Page
Legend:
= Vent terminal
V
= Air supply inlet
X
= Area where terminal is not permi�ed
15 �
Fixed
closed
M
X
Regulator vent outlet
In the event no regulator is present,
H and I can be disregarded
US Installations
Direct vent
1 ft (30 cm)
1 ft
(30 cm)
0
3 ft (91 cm)
3 ft (91 cm)
2 ft (61 cm)
2 ft (61 cm)
*
*
1 ft
(30 cm)
Installation Manual
Installation
X
1
Other than direct vent
1 ft (30 cm)
4 ft (1.2 m) below or to side of
opening;
1 ft (30 cm) above opening
0
3 ft (91 cm)
3 ft (91 cm)
2 ft (61 cm)
2 ft (61 cm)
*
*
4 ft (1.2 m) below or to side of
opening;
1 ft (30 cm) above opening
3 ft (91 cm) above if within
10 ft (3 m) horizontally.
7 ft (213 cm)
1 ft (30 cm)***
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