035-15241-003 Rev. A (201)
Unitary Products Group 13
VENTING (CATEGORY I)
This furnace is a fan-assisted Category I furnace which oper-
ates with a non-positive vent static pressure and has a flue
loss of not less than 17 percent. It may be vented vertically
using B-vent (Category I) or it may be vented horizontally
through a sidewall by using an approved accessory power
venter. For sidewall venting, follow the instructions accompa-
nying the power venter and the additional instructions in the
section on sidewall venting beginning on Page 16.
The vent installation shall be in accordance with Part 7, Vent-
ing of Equipment, of the NATIONAL FUEL GAS CODE, ANSI
Z223.1, or applicable provisions of the local building codes.
In Canada, for more information regarding vent design and
installation, refer to the latest edition of the CAN/CGA-B149
Installation Code.
1. This furnace must be connected to a factory built chim-
ney or vent complying with a recognized standard, or a
masonry or concrete chimney lined with a lining material
acceptable to the authority having jurisdiction.
2. The vent material can be single wall or B-1 (type B vent
with one-inch clearance) for the first five feet from the
furnace. Beyond five feet it must be B-1 or a permanent,
lined chimney.
3. Maintain minimum six-inch clearance to combustible
material for single wall vent and one inch clearance for
B-1 vent.
4. When using listed B-1 vent materials and/or a listed
Manufactured chimney, they must be installed in accor-
dance with the manufacturer's installation instructions
and the terms of the listing.
5. If horizontal vent pipe is required, it should be as short as
possible and pitch upward toward the vertical riser or
chimney inlet at least 1/4" per foot to help insure proper
venting.
6. Where two or more appliances are connected to a com-
mon vent or flue, use the vent tables in the venting book-
let supplied with this furnace to determine the proper
vent connector size.
7. DO NOT USE dampers or restrictors in vent piping or
flue.
8. Vent pipe sections must be securely fastened together
and fastened to the furnace flue collar using screws
where required.
9. Joints in the vent pipe must be securely made and any
horizontal run of the vent pipe must be supported less
than one support every three feet to prevent sagging.
10. This furnace may be common vented with a water heater
or other gas-fired naturally vented appliance
VENT SYSTEM SIZING
Refer to the venting tables in the NATIONAL FUEL GAS
CODE, ANSI Z223.1 for details on proper sizing of the vent
system for this furnace. The furnace is supplied with a three-
inch diameter vent connection. Some models require four
inch or five inch diameter vent pipe. The specification table
on 3 lists the proper size of vent connector pipe for each
model of furnace. If a vent pipe of more than three inch diam-
eter is required for the furnace being installed, the installer
must supply a suitable transition.
VENTING INTO AN EXISTING CHIMNEY
Whenever possible, B-1 metal pipe should be used for vent-
ing. Where use of an existing chimney is unavoidable, the fol-
lowing rules must be followed:
1. The masonry chimney must be built and installed in
accordance with nationally recognized building codes or
standards and must be lined with approved fire clay tile
flue liners or other approved liner material that will resist
corrosion, softening, or cracking from flue gases. THIS
FURNACE IS NOT TO BE VENTED INTO AN UNLINED
MASONRY CHIMNEY.
2. This furnace may be vented into a fire clay tile lined
masonry chimney only if a source of dilution air is pro-
vided, such as by common venting with a draft hood
equipped water heater. If no such source of dilution air is
available, Type B vent must be used. The existing chim-
ney may be used as a chase for the Type B vent.
3. The chimney must extend at least three feet above the
highest point where it passes through a roof of a building
and at least two feet higher than any portion of the build-
ing within a horizontal distance of ten feet.
4. The chimney must extend at least five feet above the
highest equipment draft hood or flue collar.
This furnace must not be connected into any por-
tion of a mechanical draft system operating under
positive pressure.
This furnace must not be connected to a chimney
flue serving a separate appliance designed to
burn solid fuel.
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