26
INSTALLATION INSTRUCTIONS
Venting
The following charts detail the minimal dimensional information needed to determine the proper location of the vent terminal for direct
vent and outdoor tankless water heaters.
Regulator vent outlet in the event no
regulator is present, H and I can be
disregarded.
Fixed
closed
15 ft
Fixed
closed
Inside
corner detail
Operable
Operable
V
VENT TERMINAL
X
AIR SUPPLY INLET
AREA WHERE TERMINAL IS NOT PERMITTED
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
‡ Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the oor.
Canadian Installations
1
US Installations
2
A= Clearance above grade, veranda, porch, deck
or balcony.
12 inches (30 cm) 12 inches (30 cm)
B= Clearance to window or door that may be
opened.
• 6 in (15 cm) for appliances ≤ 10,000 Btuh
(3 kW),
• 12 in (30 cm) for appliances > 10,000 Btuh
(3 kW) and ≤ 100,000 Btuh (30 kW),
• 36 in (91 cm) for appliances > 100,000 Btuh
(30 kW)
4 ft (1.2) below or to side of opening; 1 ft
(300 mm) above opening.
C= Clearance to permanently closed window. 0 in (0 cm) 0 in (0 cm)
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.
12 in (30 cm) 12 in (30 cm)
E= Clearance to unventilated soffit. 12 in (30 cm) 12 in (30 cm)
F= Clearance to outside corner. 24 in (61 cm) 24 in (61 cm)
G= Clearance to inside corner. 18 in (46 cm) 18 in (46 cm)
H = Clearance to each side of center line
extended meter/regulator assembly. above
3 feet (91 cm) within a height 15 feet (4.6 m) 3 ft (91 cm) within a height of 15 ft (4.6 m)
I = Clearance to service regulator vent outlet. 3 feet (91 cm) 3 feet (91 cm)
J = Clearance to nonmechanical air supply inlet
to building or the combustion air inlet to any
other appliance..
• 6 in (15 cm) for appliances ≤ 10,000 Btuh
(3 kW),
• 12 in (30 cm) for appliances > 10,000 Btuh
(3 kW) and ≤ 100,000 Btuh (30 kW),
• 36 in (91 cm) for appliances > 100,000 Btuh
(30 kW)
4 ft (1.2) below or to side of opening; 1 ft
(300 mm) above opening.
K = Clearance to mechanical air supply inlet.
6 feet (1.83 m)
3 feet (91 cm) above if within 10 feet (3 m)
horizontally.
L = Clearance above paved side walk or paved
driveway located on public property.
7 feet (2.13 m)
7 feet (2.13 m) for mechanical draft systems
(Category I appliances); vents for Category II
and IV appliances cannot be located above public
walkways or other areas where condensate or
vapor can cause a nuisance or hazard.
M = Clearance under veranda, porch, deck or
balcony.
12 in (30 cm) ‡ 12 in (30 cm) ‡
Horizontal Vent Terminal Location for Other than Direct Vent/Outdoor Heater
Venting for Direct-Vent Water Heater
To Next Page
Loading...
Need help?
General
