88-A801X001-1B-EN
23
General Venting
VENT PIPING
These furnaces have been classified as Fan-Assisted
Combustion System, Category I furnaces under the
"latest edition" provisions of ANSI Z21.47 standards.
Category I furnaces operate with a non-positive vent
static pressure and with a flue loss of not less than 17
percent.
Multistory and common venting are permitted for
these furnaces. Venting systems shall be in accordance
with the National Fuel Gas Code, ANSI Z223.1/NFPA 54,
local codes, and this installation manual.
If desired, a side wall termination can be accomplished
through the use of a listed "add-on" draft inducer. The
inducer must be installed according to the inducer
manufacturer’s instructions. Set the barometric
pressure relief to achieve –0.02 inch water column.
The furnace shall be connected to a factory built
chimney or vent complying with a recognized standard,
or a masonry or concrete chimney lined with a lining
material acceptable to the authority having jurisdiction.
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