Rheem Maximus - Page 19

19
D
V
V
E
FIXED
CLOSED
O
P
ERA
BL
E
O
PE
R
A
BL
E
FIXE
D
CLOSED
v
v
B
L
F
C
B
v
v
v
X
B
B
B
A
J
C
I
H
X
v
M
K
v
G
A
The following information should be used for determining the proper location of the vent terminal
for direct vent water heaters.
V
VENT TERMINAL
X
AIR SUPPLY INLET
AREA WHERE TERMINAL IS NOT PERMITTED
HORIZONTAL VENT TERMINAL LOCATION FOR POWER DIRECT VENT
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),
• 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)
• 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)
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 ft (91 cm) within a height of 15 ft (4.6 m) 3 ft (91 cm) within a height of 15 ft (4.6 m)
I = Clearance to service regulator vent outlet.
3 ft (91 cm) 3 ft (91 cm)
J = Clearance to nonmechanical air supply inlet to the
building or the combustion air inlet of any other
appliance..
• 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 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)
K = Clearance to mechanical air supply inlet.
6 ft (1.83 m)
3 ft (91 cm) above if within 10 ft (3 m)
horizontally
L = Clearance above paved side walk or paved
driveway located on public property.
7 ft (2.13 m)
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
M = Clearance under veranda, porch, deck or balcony.
12 in (30 cm) ‡
12 in (30 cm)*
INSTALLATION
Direct Vent Terminal Clearances
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.
* Permitted only if veranda porch, deck, or balcony is fully open on a minimum of two sides beneath the oor.