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COMMON VENTING
NOT ALLOWED WHEN
HORIZONTALLY
VENTING THE UNIT
HEATER.
LISTED THIMBLE
THROUGH
COMBUSTIBLE
WALL
VENT
TERMINATION
TEE
16 INCHES
MIN. (41 CM)
CONDENSATE DRAIN THROUGH VENT TERMINATION
DOWNWARD SLOPE ON HORIZONTAL VENT−RESIDENTIAL OR COMMERCIAL APPLICATION
ELBOW
OPTIONAL
DOUBLE
MALE
ADAPTER
(Cat. III
kits only)
RESIDENTIAL APPLICATIONS −− Venting must be listed special vent
for Category III appliances.
COMMERCIAL APPLICATIONS −− Venting may be single−wall (26
Ga) galvanized or equivalent stainless steel vent pipe sealed per
these instructions, OR listed special vent for Category III appliances.
SLOPE = 1/4 IN. PER FOOT RUN MAXIMUM.
NOTE − Minimum
horizontal vent length is
5 ft. This does not
include termination tee.
Refer to table 4 for
maximum length and
number of elbows.
FIGURE 9
VENTING USING A MASONRY CHIMNEY
The following additional requirements apply when a lined
masonry chimney is being used to vent the compact unit
heater.
2 - A fan-assisted unit heater may be commonly vented
into an existing lined masonry chimney provided:
a. The chimney is currently serving at least one draft-hood
equipped appliance.
b. The vent connector and chimney are sized in accordance
with venting tables.
3 - A “B1” double-wall vent or masonry chimney liner
shall terminate above the roof surface with a listed
cap or a listed roof assembly in accordance with
the terms of their respective listings and the vent
manufacturer’s instructions.
4 - Do not install a manual damper, barometric draft
regulator, or flue restrictor between the unit heater
and the chimney.
5 - If type “B1” double-wall vent is used inside a chimney,
no other appliance can be vented into the chimney.
Outer wall of type “B” vent pipe must not be exposed
to flue products.
6 - Insulation for the flexible vent pipe must be an
encapsulated fiberglass sleeve recommended by
the flexible vent pipe manufacturer.
7 - The space between liner and chimney wall should
NOT be insulated with puffed mica or any other loose
granular insulating material.
IMPORTANT
Single appliance venting of a fan-assisted unit heater
into a tile lined masonry chimney (interior or outside wall)
is prohibited. The chimney must first be lined with either
type “B-1“ vent or an insulated single-wall flexible vent
lining system, sized in accordance with venting tables in
the ANSI Z223.1, or CSA-B149 installation compliance
codes.
1 - Masonry chimneys used to vent Category I units
heaters must be either tile-lined or lined with a listed
metal lining system or dedicated gas vent. Unlined
masonry chimneys are prohibited. A category I
appliance must never be connected to a chimney
that is servicing a solid fuel appliance. If a fireplace
chimney flue is used to vent this appliance, the
fireplace opening must be permanently sealed.
