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935CA: Installation, Start-up, Operating and Service and Maintenance Instructions
8.
Avoid venting under a deck or large overhang. Recirculation could occur and cause performance or system problems. Ice build-up may occur.
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.
Item
Clearance Description
Clearance above grade, veranda, porch, deck,
A
balcony or anticipated snow level
Clearance to a window or door that may be
B
opened
C
Clearance to a permanently closed window
Vertical clearance to a ventilated soffit located
above the terminal within a horizontal distance
D
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
Clearance to each side of the centerline
H
extended above electrical meter or gas service
regulator assembly
I
Clearance to service regulator vent outlet
Clearance to non—mechanical air supply inlet to
J
building or the combustion air inlet to any other
appliance
K
Clearance to a mechanical air supply inlet
Clearance under a veranda, porch, deck, or
L
balcony
Clearance to each side of the centerline
extended above or below vent terminal of the
M
furnace to a dryer or water heater vent, or other
appliance's direct vent intake or exhaust
Clearance to a moisture exhaust duct
N
(dryer vent, spa exhaust, etc.)
0
Clearance from a plumbing vent stack
Clearance above paved sidewalk or paved
P
driveway located on public property
> greater than, ≥ greater than or equal to, < less than, ≤ less than or equal to
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 condensation 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.
These National standards apply to all non-direct-vent gas appliances. Contact Local code officials for additional requirements and/or exclusions.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Fig. 61 – Ventilated Combustion Air and Non-Direct Vent Termination Clearance
18 in. (457 mm) above roof surface.
12 in. (305 mm) for appliances >10,000 BTUh (3 kW)
36 in. (914 mm) for appliances >100,000 BTUh (30 kW)
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
above the meter/regulator assembly.
12 in. (305 mm) for appliances >10,000 Btuh(3 kW)
36 in. (914 mm) for appliances >100,000 BTUh (30 kW)
Permitted only if veranda, porch, deck, or balcony is fully open
on a minimum of two sides beneath the floor.
Vent shall not terminate above a sidewalk or paved driveway
that is located between two single-family dwellings and serves
V
(1 )
Canadian Installations
(per CAN/CSA B149.1)
12 in. (305 mm)
and </=100,000 BTUh (30 kW),
instructions.
Manufacturer's Recommendation: See Notes 3-8.
3 ft. (.9 M) within 15 ft. (4.6 M)
3ft. (.9 M)
and </= 100,000 BTUh (30 kW),
6 ft. (1.8 M)
12 in. (305 mm).
12 in. (305 mm)
12 in. (305 mm) See Note 4
3 ft. (.9 M)
7 ft. (2.1 M).
both dwellings.
45
V
U.S. Installations
(per ANSI Z223.1/NFPA 54)
12 in. (305 mm)
4ft. (1.2M) below or to the side of the opening,
1 ft (.3M) above the opening.
Manufacturer's Recommendation: See Note 8.
3 ft. (.9 M) within 15 ft. (4.6 M)
above the meter/regulator assembly.
See Note 4.
4ft. (1.2M) below or to the side of the opening,
1 ft (.3M) above the opening.
Manufacturer's Recommendation: See Note 8
3ft. (.9 M) above if within 10 ft. (3 M) horizontally
See Note 4.
Manufacturer's Recommendation: See Notes 3-8.
12 in. (305 mm)
12 in. (305 mm) See Note 4
3 ft. (.9 M)
7ft. (2.1M)
A12325
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