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Installation Code for maximum vent and vent connector lengths.
Horizontal run of the vent connector from the induced draft blower
to the chimney/vent cannot exceed the values in table 2.
4. When the length of a single wall vent, including elbows, exceeds
5 feet (1.5m), the vent shall be insulated along its entire length
with a minimum of 1/2" thick foil faced fiberglass 1-1/2# density
insulation. If a single wall vent is used in an unheated area it shall
be insulated. Failure to do so will result in condensation of flue
gases.
5. The unit may be vented vertically as a single appliance or as a
common vent with other gas-fired appliances. In common venting
situations, vent connectors for other appliances must maintain a 4"
(100mm) vertical separation between the vent connectors. Refer to
common venting tables in the (American) National Fuel Gas Code
ANSI Z223.1 or (Canada) CSA B149.1 Natural Gas and Propane
Installation Code for proper vent size.
6. Clearance to combustible material is 6" (152mm) for single wall
vent material except where a listed clearance thimble is used.
Clearance to combustible material for type B-1 vent or factory-built
chimney is per manufacturer's instructions.
7. The vent connector shall be supported without any dips or sags.
Vertical vents shall be supported in accordance with their listing and
manufacturers' instructions. All horizontal vent connector runs shall
have a slope up to the vertical vent of at least 1/4" per foot (1mm
per 50mm).
8. All vertical type B-1 vents, single wall vents, or listed chimney lining
system must be terminated with a listed vent cap or listed roof
assembly.
9. The vent must extend at least 3' (1m) above the highest point
where it passes through a roof of a building and at least 2' (0.6m)
higher than any part of a building within a horizontal distance
of 10' (3.05m) unless otherwise specified by the (American)
National Fuel Gas Code, ANSI Z223.1 or (Canada) CAN/CGA-B149
Installation Code. The vent must extend at least 5' (1.6m) above the
highest connected equipment flue collar.
MAXIMUM HORIZONTAL VENT LENGTHS
No. of Elbows
1
2
3
4
5
Maximum length of vent connector not to exceed 30 ft. (9.1m).
TABLE 2
Feet
25
7.6
20
6.1
15
4.6
10
3.0
5
1.5
Compact Unit / Utility Heater
VENT TERMINATION ON SINGLE WALL VENT
ROOF FLASHING
ROOF PITCHED FROM
SHALL NOT BE A
CONCEALED SPACE
ROOF PITCHED FROM
SEAL JOINT BETWEEN SINGLE WALL VENT
AND "B" VENT AND THE ANNULAR SPACE
C – HORIZONTAL VENTING – GENERAL
Due to changes to Z83-8 2009 CSA2.6-2009, the use of single wall
B-Vent is no longer permitted as an acceptable material when venting
horizontally, this change covers both residential and commercial
installations. All horizontally vented units manufactured after July
of 2011 must be vented as a Caterory III Unit/Utility Heater in
compliance with UL 1738 & ULS636. Common venting is not allowed
when horizontally venting the unit heater.
The minimum horizontal vent length is 3 feet (914mm).
1. If possible, do not terminate the horizontal vent through a wall
that is exposed to prevailing wind. Exposure to excessive winds can
m
affect unit performance.
2. Vent termination must be free from obstructions and at least 12"
(306mm) above grade level and maximum snow height.
3. Do not terminate vent directly below roof eaves or above a walk-
way, or any other area where condensate dripping may be trouble-
some and may cause some staining. Avoid windows where steam
may cause fogging or ice buildup.
4. When horizontally vented, minimum clearance for termination from
any door, window, gravity air inlet, gas or electric meter, regulators,
and relief equipment is 4 ft. (1.2m) for U.S. installations. Refer to
NFPA 54/ANSI Z223.1 in the U.S.A. and CSA B149.1 Natural Gas
and Propane Installation Code and .2 in Canada or with authorities
having local jurisdiction. In Canada, vent termination must have a
minimum 6 ft. (1.8 m) horizontal clearance from gas and electric
meters and relief devices as specified in the Canadian B149.1, Natu-
ral Gas Installation Code.
5. Vent termination must be a minimum of 4' (1.2m) below or 4'
(1.2m) horizontally from any soffit vent or under-eave vent.
6. Vent must be a minimum of 6' from an inside corner formed by two
exterior walls. If possible, leave a 10' clearance.
6
Operating Instructions and Owner's Manual
SINGLE WALL TERMINATION
0°
45°
TO
DOUBLE WALL (TYPE B-1) TERMINATION
ROOF FLASHING
0°
45°
TO
12" MAX
OF THE "B" VENT
2" CLEARANCE
THIMBLE
CLEARANCE TO BE AS
SPECIFIED ON TYPE "B"
VENT PIPE
FIGURE 2
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