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WARNING:
CARBON MONOXIDE POISONING
HAZARD
1. Seal any unused openings in the
venting system
2. Inspect the venting system for proper
size and horizontal pitch, as required
in the National Fuel Gas Code, ANSI
Z223.1 or the CAN/CGA B149 Instal-
lation Codes and these instructions.
Determine that there is no blockage
or restriction, leakage, corrosion and
other deficiencies which could cause
an unsafe condition.
3. So far as is practical, close all building
doors and windows and all doors
between the space in which the
appliance(s) connected to the
venting system are located and other
spaces of the building.
4. Follow the lighting instructions. Place
the appliance being inspected in
operation. Adjust thermostat so
appliance
continuously.
5. Turn on clothes dryers and any other
appliance not connected to the
venting system. Turn on any exhaust
fans, such as range hoods and
bathroom exhausts, so they shall
operate at maximum speed. Do not
operate a summer exhaust fan.
6. Close fireplace dampers.
7. Test for spillage from draft hood
equipped appliance at the draft hood
relief opening after 5 minutes of main
burner operation. Use the flame of a
match or candle.
8. If improper venting is observed during
any of the above tests, the venting
system must be corrected in
accordance with the National Fuel
Gas Code, ANSI Z223.1/NFPA 54 and/
or CSA B149.1, Natural Gas and
Propane Installation Codes.
9. After it has been determined that
each appliance connected to the
venting system properly vents when
tested as outlined above, return
doors, windows, exhaust fans,
fireplace dampers and any other gas
burning appliance to their previous
conditions of use.
20
shall
operate
Vent Pipe Material
Vent and combustion air pipe and fittings must
be one of the following materials and must
conform to the indicated ANSI/ASTM stan-
dards:
Material
Schedule 40 PVC
PVC-DWV
SDR-21*
& SDR-26*
ABS-DWV
Schedule 40 ABS
Foam/Cellular Core PVC
*In Canada, check the local codes to ensure that
SDR is approved for use. SDR is not approved
for all Canadian installations.
Cement and primer must conform to ATSM
Standard D2564 for PVC and Standard D2235
for ABS. When joining PVC piping to ABS, use
PVC solvent cement. (See procedure specified
in ASTM Standard D3138.)
Vent Pipe Length and Diameter
In order for the furnace to operate properly, the
combustion air and vent piping must not be exces-
sively restrictive. To ensure this use Table 4,
which indicates the maximum allowable piping
length for a furnace of specified input rate, when
installed with piping of selected diameter and
number of elbows. This table applies to the length
and number of elbows for each pipe. To use the
table, the furnace input rate, the centerline length
and the number of elbows on each pipe must be
known. Choose the diameter for which the tabu-
lated length is equal to or greater than required.
Vent Configuration to
Provide 12" Minimum
height above
Snow Level.
Outside
Wall
1/2"
Armaflex
Insulation or
Equivalent
(if required)
Figure 20. Alternate Horizontal Vent
Installation
Standard
D1785
D2665
D2241
D2661
F628
F891
12" Min.
19" Max.
Support
12" Above
Normally
Expected
Snow
Level
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