INS
TALLA
TION
26
On-Demand Water Heater Installation Manual and Owner’s Guide
-Vent termination clearances-
Canada Installations
1
US Installations
2
Direct vent and other than direct vent Direct vent
Other than direct vent
A Clearance above grade, veranda, porch, deck, or balcony
1 ft (30 cm)
1 ft (30 cm)
B Clearance to window or door that may be opened
3 ft (91 cm)
1 ft
(30 cm)
4 ft (1.2 m) below or to side
of opening; 1 ft (30 cm)
above opening
C Clearance to permanently closed window
0
0
0
D
Vertical clearance to ventilated soffit located above
the vent terminator within a horizontal distance of 2
feet (61cm) from the center line of the termination
3 ft (91 cm)
3 ft (91 cm)
3 ft (91 cm)
E Clearance to unventilated soffit
3 ft (91 cm)
3 ft (91 cm)
3 ft (91 cm)
F Clearance to outside corner
2 ft (61 cm)
2 ft (61 cm)
2 ft (61 cm)
G Clearance to inside corner
2 ft (61 cm)
2 ft (61 cm)
2 ft (61 cm)
H Clearance to each side of center line extended
above meter/regulator assembly
3 ft (91 cm)
*
*
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 maxi-
mum vertical distance of 15 ft (4.5 m)
*
*
J
Clearance to non-mechanical air supply inlet to
a building or the combustion air inlet to any other
appliance.
3 ft (91 cm)
1 ft
(30 cm)
4 ft (1.2 m) below or to side
of opening; 1 ft (30 cm)
above opening
K Clearance to mechanical air supply inlet
6 ft (183 cm)
3 ft (91 cm) above if within
10 ft (3 m) horizontally.
L Clearance above paved sidewalk or paved driveway
located on public property
7 ft (213 cm)**
7 ft
(213 cm)
7 ft (213 cm)
M Clearance under veranda, porch deck, or balcony
1 ft (30 cm)***
1 ft
(30 cm)***
1 ft (30 cm)***
*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:
1). over public walkways; or
2). 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
3). 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 CSA B149.1,
Natural Gas and Propane Installation Code
2)
In accordance with the current ANSI Z223.1/NFPA 54
, National Fuel Gas Code
H
D
E
L
B
V
V
V
V
B
F
C
B
B
B
V
V
V
V
V
X
X
A
J
M
Operable
Fixed
closed
Fixed
closed
Operable
B
Inside corner
detail
G
A
K
V
X
= Vent terminal
= Air supply inlet
= Area where the terminal
is not permitted
Regulator/Gas meter
vent outlet
I
INSTALLATION
Step 8:
Clearances
Step 8:
Clearances
Summary of Contents for 160X3P
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