APPLICATION
PVC,CPVC or ABS
SCH. 40 Pipe Size
Model M3RL 060
Model M3RL 080
MAXIMUM
DIRECT VENT, DUAL
PIPE LENGTH (ft.)*
Inlet/Outlet
3" 3"
50 50
50 50
*NOTES
1. Subtract 3.5 ft. for each additional 3" 90 degree elbow.
2. Two45degree elbowsare equivalent toone 90degree elbow
3 One short radius elbow is equivalent to two long radiu,_
elbows.
4. Do not include terrnination elbows incalculation of vent length
5 This table is applicable for elevations from sea levelto 400(
ft. Forhigher elevations, decreasevent pipe lengthsby 8%pe
1000 ft. of altitude
6 Only the above pipematerialsare approved for usewith thes(
condensing furnaces.
Tabie 6. Vent Tabie
/
/
/
/
/
/
_J VENT TERMINAL (_ AiR SUPPLY INLET [] AREA WHERE TERMINAL iS NOT PERMITTED
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 tine 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 tine
extended above meter/regulator assembly
I = Clearance to service regulator vent outlet
J = Clearance to nonmechanicaI air supply inlet
to building or the combustion air inlet to any
other appliance
Canadian Installations 1
12 inches (30 cm)
K = Clearance to a mechanical air supply inlet
L = Clearance above paved sidewatk or paved 7 feet (2.13 m) 1
driveway located on public property
M = Clearance under veranda, porch deck, or 12 inches (30 cm) $
balcony
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)
3 feet (91 cm) within a height 15 feet
above the meter/regulator assembly
3 feet (1.83 m)
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 feet (1.83 m)
US Installations 2
12 inches (30 cm)
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) fol
appliances > 50,000 Btuh (15 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) fol
appliances > 50,000 Btuh (15 kW)
3 feet (91 cm) above if within 10 feet (3 m)
horizontally
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
1 A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family
dwellings and serves both dweltings
_: Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
* For clearances not specified in ANSI Z223.! / 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 15. Vent Termination Clearances for Direct Vent Furnaces
15
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