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Venter Gasket
Figure 7
Main Line
Entry
4. Combustion & Ventilation Air
WARNING
!
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in
personal injury or death.
Use methods described here to provide
combustion and ventilation air.
Furnaces require ventilation openings to provide sufficient air for
proper combustion and ventilation of flue gases. All duct or
openings for supplying combustion and ventilation air must
comply with the gas codes, or in the absence of local codes, the
applicable national codes.
Combustion and ventilation air must be supplied in accordance
with one of the following:
Note: The Combustion & Ventilation Air Section, in this document,
uses tables and information from the ANSI Z223.1/NFPA
54!2009. For use in Canada, use CSA B149.1 for this
information.
1. Section 9.3, Air for Combustion and Ventilation, of the National
Fuel Gas Code, (NFGC), ANSI Z223.1/NFPA 54!2009 in the
U.S.,
2. Sections 8.2, 8.3, 8.5, 8.6, 8.7, and 8.8 of National Standard of
Canada, Natural Gas and Propane Installation Code
(NSCNGPIC), CSA B149.1!05 in Canada,
3. Applicable provisions of the local building code.
When the installation is complete, check that all appliances have
adequate combustion air and are venting properly. See Venting
And Combustion Air Check in "Gas Vent Installation" Section in
this manual.
Contaminated Combustion Air
Installations in certain areas or types of structures could cause
excessive exposure to contaminated air having chemicals or
halogens that will result in safety and performance related
problems and may harm the furnace. These instances must use
only outdoor air for combustion.
The following areas or types of structures may contain or have
exposure to the substances listed below. The installation must be
441 01 2613 05
25-23-52c
25-23-52b
Specifications are subject to change without notice
Subject to change without notice.
7. Tighten the three (3) or four (4) screws that secure the venter
assembly to the collector box. Do tighten screws enough to
compress venter gasket.
8. Replace power leads to venter motor and reconnect hose to
pressure switch.
NOTE: Unused open vent hole must be covered. A Vent Cover is
supplied with Vent Pipe Shield Kit NAHA002VC. A 5
diameter Vent Cover is available separately from your distributor,
or one can be fabricated with sheet metal for all side vent
installations.
evaluated carefully as it may be necessary to provide outdoor air
for combustion.
•
Commercial buildings.
•
Buildings with indoor pools.
•
Furnaces installed in laundry rooms.
•
Furnaces installed in hobby or craft rooms.
•
Furnaces installed near chemical storage areas.
•
Permanent wave solutions for hair.
•
Chlorinated waxes and cleaners.
•
Chlorine based swimming pool chemicals.
•
Water softening chemicals.
•
De!icing salts or chemicals.
•
Carbon tetrachloride.
•
Halogen type refrigerants.
•
Cleaning solvents (such as perchloroethylene).
•
Printing inks, paint removers, varnishes, etc.
•
Hydrochloric acid.
•
Sulfuric Acid.
•
Solvent cements and glues.
•
Antistatic fabric softeners for clothes dryers.
•
Masonry acid washing materials.
Outdoor Combustion Air Method
A space having less than 50 cubic feet per 1,000 BTUH (4.8 cubic
meters per kW) input rating for all gas appliances installed in the
space requires outdoor air for combustion and ventilation.
Air Openings and Connecting Ducts
1. Total input rating for all gas appliances in the space MUST be
considered when determining free area of openings.
2. Connect ducts or openings directly to the outdoors.
3. When screens are used to cover openings, the openings
MUST be no smaller than
4. The minimum dimension of air ducts MUST NOT be less than
3"(76.2mm).
5. When sizing a grille, louver or screen use the free area of
opening. If free area is NOT stamped or marked on grill or
louver, assume a 20% free area for wood and 60% for metal.
Screens shall have a mesh size not smaller than
Requirements
1. Provide the space with sufficient air for proper combustion and
ventilation of flue gases using horizontal or vertical ducts or
openings.
National Excelsior Company
www.excelsiorhvac.com
5
" (135mm)
/
16
1
" (6.4mm) mesh.
/
4
1
/
"(6.4mm).
4
9
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