# 45465K005
Page 7
If at any time in the future the installation of
this furnace is changed to require outside
fresh air for combustion, the inlet air restrictor
plate must be removed. Failure to do so could
cause improper operation that can result in a
fire hazard or carbon monoxide injury.
WARNING
Sidewall Venting
This furnace can be sidewall (horizontally) vented with a
listed sidewall venter, such as Field Controls Model SWG-
4HD with CK-43 Control Kit, or Tjernlund Model GPAK-JT.
Category I venting classification is maintained when vented
in this manner. The furnace, power venter, and control kit
(where applicable) must be installed in accordance with their
installation instructions and all applicable codes.
The following limitations also apply to the two previously
mentioned venters:
Vent pipe diameter:
4"
Minimum vent pipe length:
4'
Maximum vent pipe length:
25'*
Maximum number of 90° elbows:
4
* When fewer than four elbows are used, maximum vent
pipe length can be increased by 5' per unused elbow.
For Canadian installations, only the Field Controls
venter and control kit are authorized by CSA for use
with this furnace.
See Figures 9 and 10 on pages 8 and 9 for information on
where the sidewall vent terminal can and cannot terminate.
Vertical Venting (Using Inside Air for Combustion)
Category I furnaces must be vented vertically or nearly
vertically. Common venting and multistory venting are
permitted when done in accordance with applicable
codes, such as local and national codes.
The venting system should be designed in accordance with
the “FAN” columns in the venting tables in the latest editions
of the National Fuel Gas Code, ANSI Z223.1/NFPA 54 or the
CSA B149.1, Natural Gas and Propane Installation Codes.
For installations using inside air for combustion, the inlet
air restrictor plate (supplied) must be installed in the air
inlet pipe as shown in Figure 8. See the
Venting
section
beginning on page 6 for more information.
Figure 8
Inlet Air Restrictor Plate Placement
If this furnace is used to replace an existing furnace, it is
possible that the existing venting system is not suitable
for venting this furnace.
Furthermore, the existing venting
system may have to be modified to properly vent any other
gas appliance (such as a water heater) that remains con-
nected to it. Carefully read the
Sidewall Venting
,
Vertical
Venting
, and
Existing Vent Systems
sections that follow to
determine proper venting practices for the installation.
Installation shall be in accordance with Parts 7 and 11 of
the National Fuel Gas Code, ANSI Z223.1/NFPA 54 (latest
edition) and/or Section 7 and Appendix B of the CSA
B149.1, Natural Gas and Propane Installation Codes
(latest edition); local building codes; vent manufacturer
instructions; and these instructions.
1.
Consult local building codes for installation requirements.
2.
The vent connector should be as short as possible with
the least number of elbows and angles to do the job.
For 100K, 125K, and 150K BTUH input models,
the minimum vent connector diameter is 5". The
transition from 4" diameter flue outlet to 5"
diameter pipe must be made at the flue outlet.
IMPORTANT
