John Wood Commercial - 300-400K BTU - Manual (Page 34)

34
termination clearances sidewall direct Vent
V X
VENT TERMINAL AIR SUPPLY INLET AREA WHERE TERMINAL IS NOT PERMITTED
v
v
A
G
V
FIXED
CLOSED
FIXED
CLOSED
OPERABLE
OPERABLE V
C B
B
B
B
F
B
V
V
A
J
V
H
M
X
X
V
V
K
B
E
D
L
DIRECT VENT
(using outdoor air for combustion)
EXTERIOR CLEARANCES FOR SIDEWALL VENT TERMINATION
figure 49
Vent terminal clearances for “Direct Vent” installations. Direct Vent configurations use outdoor air for combustion.
canadian installations
1
us installations
2
canadian installations
1
us installations
2
a
Clearance above grade,
veranda, porch, deck or
balcony
12 inches (30 cm) 12 inches (30 cm) h
Clearance to each side
of center line extended
above meter/regulator
assembly
3 feet (91 cm) within a height 15
feet (4.5 m) above the meter/
regulator assembly
3 feet (91 cm) within a height
15 feet (4.5 m) above the
meter/regulator assembly*
b
Clearance to window or
door that may be opened
6 inches (15 cm) for appliances
up to 10,000 btu/hr (3 kW), 12
inches (30 cm) for appliances
between 10,000 btu/hr (3 kW)
and 100,000 btu/hr (30 kW), 36
inches (91 cm) for appliances
above 100,000 btu/hr (30 kW)
6 inches (15 cm)
for appliances up to
10,000 btu/hr (3 kW),
9 inches (23 cm) for
appliances between
10,000 btu/hr (3 kW)
and 50,000 btu/hr (15
kW), 12 inches (30 cm)
for appliances above
50,000 btu/hr (15 kW)
i
Clearance to service
regulator vent outlet
3 feet (91 cm) 3 feet (91 cm)*
c
Clearance to
permanently closed
window
6 inches (15 cm)* 6 inches (15 cm)* j
Clearance to a non
mechanical air supply
inlet into building or
combustion air inlet to
any other appliance
6 inches (15 cm) for appliances up
to 10,000 btu/hr (3 kW), 12 inches
(30 cm) for appliances between
10,000 btu/hr (3 kW) and 100,000
btu/hr (30 kW), 36 inches (91 cm)
for appliances above 100,000 btu/
hr (30 kW)
6 inches (15 cm) for
appliances up to 10,000
btu/hr (3 kW), 9 inches (23
cm) for appliances between
10,000 btu/hr (3 kW) and
50,000 btu/hr (15 kW), 12
inches (30 cm) for appliances
above 50,000 btu/hr (15 kW)
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 inches (30 cm)* 12 inches (30 cm)* k
Clearance to a
mechanical air supply
inlet 6 feet (1.83 m)
3 feet (91 cm) above if within
10 feet (3 m) horizontally
e
Clearance to unventilated
soffit
12 inches (30 cm)* 12 inches (30 cm)* l
Clearance above
paved sidewalk or
paved driveway located
on public property
7 feet (2.13 m)† 7 feet (2.13 m)†*
f
Clearance to outside
corner
2 feet (60 cm)* 2 feet (60 cm)* m
Clearance under
veranda, porch, deck,
or balcony
12 inches (30 cm) ‡ 12 inches (30 cm) ‡*
g
Clearance to inside
corner
18 inches (45 cm)* 18 inches (45 cm)*
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.
† 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.
* Clearance in accordance with local installation codes and the requirements of the gas supplier and the manufacturer’s installation instructions.