Installation guide
Venting and Combustion Air Check
NOTE: When an existing Category I furnace is removed or re-
placed, the original venting system may no longer be sized to prop-
erly vent the attached appliances, and to make sure there is
adequate combustion air for all appliances, MAKE THE FOL-
LOWING CHECK.
CARBON MONOXIDE POISONING HAZARD
Failure to follow the steps outlined below for each
appliance connected to the venting system being placed
into operation, could result in carbon monoxide
poisoning or death:
The following steps shall be followed for each appliance
connected to the venting system being placed into
operation, while all other appliances connected to the
venting system are not in operation:
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/NFPA 54 or CSA B 149. 1, Natural Gas and Propane
Installation Code and these instructions. Determine that
there is no blockage or restriction, leakage, corrosion and
other deficiencies which could cause an unsafe condition.
3.As far as 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.Close fireplace dampers.
5.Turn on clothes dryers and any appliance not connected to
the venting system. Turn on any exhaust fans, such as
range hoods and bathroom exhausts, sothey are operating
at maximum speed. Do not operate a summer exhaust fan.
6.Follow the lighting instructions. Place the appliance being
inspected into operation. Adjust the thermostat so
appliance is operating continuously.
7.Test for spillage from draft hood equipped appliances at the
draft hood relief opening after 5 minutes of main burner
operation. Use the flame of a match or candle. (Figure 4)
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
Code.
9.After it has been determined that each a pplia nce connected
to the venting system properly vents when tested as out-
lined above, return doors, windows, exhaust fans, fireplace
dampers and any other gas-fired burning appliance to their
previous conditions of use.
Vent Check
VentPipe _1 I A/ Draft Hood
Typical Gas
Water Heater
! !
NOTE: If Elaine p_ulls towards draft hoo_, this indicates
sufficient infiltration air.
Venting to Existing Masonry Chimney
Dedicated venting of one fan assisted furnace into any ma-
sonry chimney is restricted. A chimney must first be lined with
either Type B vent sized in accordance with NFGC tables 13.1 or
13.2 or a listed metal lining system, sized in accordance with the
NFGC section 13.1.7 for a single appliance or 13.2.19 for multiple
appliances, or NSCNGPIC Appendix C, section 10. (See Section 6
Masonry Chimney Venting of these instructions.)
Listed, corrugated metallic chimney liner systems in masonry
chimneys shall be sized in the U.S. by using NFGC tables per
13.1.7 for dedicated venting and per 13.2.19 for common venting
with the maximum capacity reduced by 20% (0.80 X maximum ca-
pacity) and the minimum capacity as shown in the applicable table.
Corrugated metal vent systems installed with bends or offsets re-
quire additional reduction of 5% of the vent capacity for each bend
up to 45 ° and 10% of the vent capacity for each bend from 45 ° up to
90 °. In Canada, use the NSCNGPIC.
NOTE: Two(2) 45 ° elbows are equivalent to one (1) 90 ° elbow.
Combined Venting into a Masonry Chimney
Venting into a masonry or concrete chimney is only permitted
as outlined in the NFGC or NSCNGPIC venting tables. Follow
all safe venting requirements.
Note: See section "6. Masonry Chimney Venting'.
_] 441 01 2314 02