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INDUCED DRAFT BLOWER
CATEGORY III VENT ACCORDING TO THESE INSTALLATION INSTRUCTIONS.
SLOPE: +¼ INCH FOR 1 FOOT RUN MINIMUM (1mm per 50mm)
NOTE - MINIMUM HORIZONTAL LENGTH 3FT. (1.5M)
NOT INCLUDING CAP FOR TERMINATION
MAXIMUM HORIZONTAL LENGTH AND NUMBER OF ELBOWS REFER TO TABLE 2
COMMON VENTING NOT ALLOWED WHEN HORIZONTALLY VENTING THE UNIT / UTILITY HEATER
F – VENTING USING A MASONRY CHIMNEY
The following additional requirements apply when a lined masonry
chimney is being used to vent the compact unit / utility heater.
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.
2. A fan assisted unit heater may be commonly vented into an existing
lined masonry chimney provided:
• The chimney is currently serving at least one draft-hood equipped
appliance.
• The vent connector and chimney are sized in accordance with
venting tables in the (American) National Fuel Gas Code ANSI
Z223.1 or (Canada) CSA B149.1 Natural Gas and Propane
Installation Code.
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 (American) National Fuel Gas Code ANSI
Z223.1 or (Canada) CSA B149.1 Natural Gas and Propane Installation
Code.
3. A type B-1 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 B-1 double-wall vent is used inside a chimney, no other
appliance can be vented into the chimney. Outer wall of type B-1
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.
HORIZONTAL VENTING - RESIDENTIAL INSTALLATION
FLUE TRANSITION
Compact Unit / Utility Heater
UPWARD SLOPE
(PROVIDED)
LISTED THIMBLE THROUGH
COMBUSTION WALL
7. The space between liner and chimney wall should NOT be insulated
with puffed mica or any other loose granular insulating material.
8. If type B-1 vent or an insulated flexible vent pipe cannot be used
as liners, the chimney must be rebuilt to accommodate one of
these methods or some alternate approved method must be found
to vent the appliance. When inspection reveals that an existing
chimney is not safe for the intended purpose, it shall be rebuilt to
conform to nationally recognized standards, lined or relined with
suitable materials or replaced with a gas vent or chimney suitable
for venting unit heaters. The chimney passageway must be checked
periodically to ensure that it is clear and free of obstructions.
G –REMOVAL OF UNIT FROM COMMON VENT
In the event that an existing unit heater is removed from a venting
system commonly run with separate gas appliances, the venting
system is likely to be too large to properly vent the remaining
attached appliances. The following test should be conducted while
each appliance is in operation and the other appliances are not in
operation, yet remain connected to the common venting system. If
the venting system has been installed improperly, the system must be
corrected.
1. Seal any unused openings in the common venting system.
2. Visually inspect the venting system for proper size and horizontal
pitch. Determine there is no blockage or restriction, leakage,
corrosion, or other deficiencies which could cause an unsafe
condition.
3. If practical close all building doors and windows and all doors
between the space in which the appliances remaining connected
to the common venting system are located and other spaces of the
building. Turn on clothes dryers and any appliances not connected
to the common venting system. Turn on any exhaust fans, such
as range hoods and bathroom exhausts, so they will operate at
maximum speed. Do not operate a summer exhaust fan. Close
fireplace dampers.
4. Follow the lighting instructions. Place the appliance being
inspected in operation. Adjust thermostat so appliance will operate
continuously.
8
Operating Instructions and Owner's Manual
12 INCHES MIN
(30.5 CM)
VENT TERMINATION CAP
FIGURE 5
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