59CU5A: Installation, Start-up, Operating and Service and Maintenance Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
45
A12326
Fig. 60 – Direct Vent Termination Clearance
NOTE:
The following is based upon National codes for gas appliances and is provided as a reference.
Refer to local codes which may supersede these standards and/or recommendations.
>
greater than,
≥
greater than or equal to,
<
less than,
≤
less than or equal to
Item
Clearance Description
Canadian Installations
(1 )
(per CAN/CSA B149.1)
U.S. Installations
(2 )
(per ANSI Z223.1/NFPA 54)
A
Clearance above grade, veranda, porch, deck,
balcony or anticipated snow level
12 in. (305 mm)
18 in. (457 mm) above roof surface.
12 in. (305 mm)
B
Clearance to a window or door that may be
opened
12 in. (305 mm) for appliances >10,000 Btuh (3 kW)
and </=100,000 Btuh ( 30 kW),
36 in. (914 mm) for appliances >100,000 Btuh (30 kW)
9 in. (229 mm) for appliances >10,000 Btuh (3 kW)
and </= 50,000 Btuh ( 15 kW),
12 in. (305 mm) for appliances >50,000 Btuh
(15kW)
C
Clearance to a permanently closed window
For clearances not specified in ANSI Z223.1/NFPA 54 or CAN/CSA B149.1, clearances shall be in accordance with
local installation codes and the requirements of the gas supplier and the manufacturer’s installation instructions.
Manufacturer’s Recommendation: See Notes 3-8.
D
Vertical clearance to a ventilated soffit located
above the terminal within a horizontal distance
of 2 feet (61 cm) from the centerline of the
terminal
E
Clearance to an unventilated soffit
F
Clearance to an outside corner
G
Clearance to an inside corner
H
Clearance to each side of the centerline
extended above electrical meter or gas service
regulator assembly
3 ft. (.9 M) within 15 ft. (4.6 M)
above the meter/regulator assembly.
3 ft. (.9 M) within 15 ft. (4.6 M)
above the meter/regulator assembly.
I
Clearance to service regulator vent outlet
3ft. (.9 M)
See Note 4.
J
Clearance to non—mechanical air supply inlet
to building or the combustion air inlet to any
other appliance
12 in. (305 mm) for appliances >10,000 Btuh(3 kW)
and </= 100,000 Btuh ( 30 kW),
36 in. (914 mm) for appliances >100,000 Btuh (30 kW)
9 in. (9 mm) for appliances >10,000 Btuh (3 kW)
and </= 50,000 Btuh (15 kW),
12 in.(305 mm) for appliances >50,000 Btuh
(15kW)
K
Clearance to a mechanical air supply inlet
6 ft. (1.8 M)
3ft. (.9 M) above if within 10 ft. (3 M) horizontally
L
Clearance under a veranda, porch, deck, or
balcony
12 in. (305 mm).
Permitted only if veranda, porch, deck, or balcony is fully open
on a minimum of two sides beneath the floor.
See Note 4.
Manufacturer’s Recommendation: See Notes 3-8.
M
Clearance to each side of the centerline
extended above or below vent terminal of the
furnace to a dryer or water heater vent, or
other appliance’s direct vent intake or exhaust
12 in. (305 mm)
12 in. (305 mm)
N
Furnace combustion air intake clearance to a
water heater vent, dryer vent or other types of
appliance exhausts.
3 ft. (.9 M)
3 ft. (.9 M)
0
Clearance from a plumbing vent stack
3 ft. (.9 M)
3 ft. (.9 M)
P
Clearance above paved sidewalk or paved
driveway located on public property
7 ft. (2.1 M)
Vent shall not terminate above a sidewalk or paved driveway
that is located between two single family dwellings and serves
both dwellings.
See Note 4.
Manufacturer’s Recommendation: See Notes 3-8.
Notes:
1. In accordance with the current CAN/CSA B149.1, Natural Gas and Propane Installation Code.
2. In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code
3. NOTE: This table is based upon National codes for gas appliances, and are provided as a reference.
Refer to Local codes which may supersede these standards and/or recommendations.
4. For clearances not specified in ANSI Z223.1/NFPA 54 or CAN/CSA B 149.1, clearances shall be in accordance with local installation codes and the requirements of the gas supplier
and the manufacturer’s installation instructions.
5. When locating vent terminations, consideration must be given to prevailing winds, location, and other conditions which may cause recirculation of the combustion products of
adjacent vents. Recirculation can cause poor combustion, inlet condensate problems, vent termination icing and/or accelerated corrosion of the heat exchangers.
6. Design and position vent outlets to avoid ice build-up on and moisture damage to surrounding surfaces.
7. The vent for this appliance shall not terminate:
a. Near soffit vents of crawl space vents or other areas where condensate or vapor could create a nuisance or hazard or property damage; or
b. Where condensate vapor could cause damage or could be detrimental to the operation of regulators, relief valves, or other equipment.
8. Avoid venting under a deck or large overhang. Recirculation could occur and cause performance or system problems. Ice build-up may occur.
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