Rheem Maximus Manual page 19

Direct Vent Terminal Clearances
X AIR SUPPLY INLET
V VENT TERMINAL
HORIZONTAL VENT TERMINAL LOCATION FOR POWER DIRECT VENT
The following information should be used for determining the proper location of the vent terminal
for direct vent water heaters.
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.
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.
E= Clearance to unventilated soffit.
F= Clearance to outside corner.
G= Clearance to inside corner.
H = Clearance to each side of center line extended
meter/regulator assembly. above
I = Clearance to service regulator vent outlet.
J = Clearance to nonmechanical air supply inlet to the
building or the combustion air inlet of any other
appliance..
K = Clearance to mechanical air supply inlet.
L = Clearance above paved side walk or paved
driveway located on public property.
M = Clearance under veranda, porch, deck or balcony.
In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code
1
In accordance with the current ANSI Z223.1/ NFPA 54 National Fuel Gas Code.
2
‡ Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
* Permitted only if veranda porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
AREA WHERE TERMINAL IS NOT PERMITTED
Canadian Installations
12 inches (30 cm)
• 6 in (15 cm) for appliances < 10,000 Btuh (3
kW),
• 9 in (23 cm) for appliances > 10,000 Btuh (3
kW) and < 50,000 Btuh (15 kW),
• 12 in (30 cm) for appliances > 50,000 Btuh (15
kW)
0 in (0 cm)
12 in (30 cm)
12 in (30 cm)
24 in (61 cm)
18 in (46 cm)
3 ft (91 cm) within a height of 15 ft (4.6 m)
3 ft (91 cm)
• 6 in (15 cm) for appliances < 10,000 Btuh (3 kW),
• 9 in (23 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)
6 ft (1.83 m)
7 ft (2.13 m)
12 in (30 cm) ‡
INSTALLATION
US Installations
1
12 inches (30 cm)
• 6 in (15 cm) for appliances < 10,000 Btuh (3
kW),
• 9 in (23 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)
0 in (0 cm)
12 in (30 cm)
12 in (30 cm)
24 in (61 cm)
18 in (46 cm)
3 ft (91 cm) within a height of 15 ft (4.6 m)
3 ft (91 cm)
• 6 in (15 cm) for appliances < 10,000 Btuh (3
kW),
• 9 in (23 cm) for appliances > 10,000 Btuh (3
kW) and < 50,000 Btuh (15 kW),
• 12 in (30 cm) for appliances > 50,000 Btuh
(15 kW)
3 ft (91 cm) above if within 10 ft (3 m)
horizontally
7 ft (2.13 m) for mechanical draft system
(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
12 in (30 cm)*
2
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