Nordyne RL 90+ - Manual (Page 23)

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VENT TERMINAL 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
† 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 fl oor.
* For clearances not specifi ed in ANSI Z223.1 / NFPA 54 or CSA B149.1, the following statement shall be included:
“Clearance in accordance with local installation codes, and the requirements of the gas supplier and the manufacturer’s
installation instructions.”
Figure 19. Vent Termination Clearances for Direct Vent Furnaces
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 inches (15 cm) for appliances 10,000
Btuh (3 kW), 12 inches (30 cm) for
appliances > 10,000 Btuh (3 kW) and
100,00 Btuh (30 kW), 36 inches (91 cm)
for appliances >100,00 Btuh (30 kW) 6 inches (15 cm) for appliances 10,000
Btuh (3 kW), 9 inches (23 cm) for
appliances > 10,000 Btuh (3 kW) and
50,000 Btuh (15 kW), 12 inches (30 cm)
for appliances > 50,000 Btuh (15 kW)
C = Clearance to permanently closed window * *
D = Vertical clearance to ventilated soffi t
located above the terminal within a
horizontal distance of 2 feet (61 cm) from
the center line of the terminal
* *
E = Clearance to unventilated soffi t * *
F = Clearance to outside corner * *
G = Clearance to inside corner * *
H = Clearance to each side of center line
extended above meter/regulator assembly
3 feet (91 cm) within a height 15 feet
above the meter/regulator assembly
*
I = Clearance to service regulator vent outlet 3 feet (1.83 m) *
J = Clearance to nonmechanical air supply inlet
to building or the combustion air inlet to any
other appliance
6 inches (15 cm) for appliances 10,000
Btuh (3 kW), 12 inches (30 cm) for
appliances > 10,000 Btuh (3 kW) and
100,00 Btuh (30 kW), 36 inches (91 cm)
for appliances >100,00 Btuh (30 kW) 6 inches (15 cm) for appliances 10,000
Btuh (3 kW), 9 inches (23 cm) for
appliances > 10,000 Btuh (3 kW) and
50,000 Btuh (15 kW), 12 inches (30 cm)
for appliances > 50,000 Btuh (15 kW)
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
L = Clearance above paved sidewalk or paved
driveway located on public property
7 feet (2.13 m) †
*
M = Clearance under veranda, porch deck, or
balcony
12 inches (30 cm) ‡
*