Venting - Goodman GMNT Installation & Operating Instructions Manual

Attaching Combustion Air Intake Fitting. A coupling for
attaching the combustion air fitting to the furnace cabinet
is included in a plastic bag packaged with the furnace. The
fitting is sized to accept a 3" diameter PVC pipe. In certain
situation, a 2" diameter pipe can be used for this application.
Refer to the combustion/ vent table for sizing requirements.
Attach the fitting to the cabinet using (4) #10 x 1/2" sheet
metal screws (field supplied). If a right hand entrance is
preferred, the plug installed on this side is to be removed
and reinstalled in the left side opening.
Non-Direct Vent Combustion Air. If the furnace is to be
installed as a non-direct vent appliance, the combustion air
pipe outlined previously is not used.
As a non-direct vent furnace, this must be installed in
accordance with the combustion and ventilation air
requirements found in ANSI Z221.3, section 5.3. When
installed as a non-direct vent furnace in an area, which is
deemed as a confined area, see (ANSI Z223.1, section 1.7,
"Space, Confined") the requirements are as follows:
All Combustion Air Taken From The Inside Of The
Building. When installed as a non-direct vent furnace and
indoor air is used as the combustion air source, the space
is to be provided with (2) permanent openings communicating
directly with an additional room(s) of sufficient volume so
that the combined volume of all spaces meets the criteria of
an unconfined area. The total input of all gas burning
equipment shall be used to determine the minimum size of
each opening. Each opening shall be sized to be a minimum
of 1 square inch of free area per 1,000 Btu/hr of combined
input of gas utilization equipment in the area. The minimum
area for each opening shall not be less than 100 square
inches, and the minimum dimension of these openings shall
not be less than 3 inches. One opening shall commence
within 12 inches of the top of the area, while the other opening
shall commence within 12 inches of the bottom of the area.
All Combustion Air Taken From Outdoors. If installed
as a non-direct furnace and outdoor air is selected as the
combustion air source, then area shall be serviced with an
opening(s) communicating directly with the outdoors by either
of the following two methods. When calculating the minimum
area for each opening, the combined input of all gas utilization
equipment is to be considered. Also, the minimum
dimension for any opening shall not be less than 3 inches.
Method 1..... Two permanent openings communicating
directly with the outdoors via. horizontal ducts shall be
sized to be a minimum of 1 square inch per 4,000 Btu/hr
or, two permanent openings communicating directly with
the outdoors via. vertical ducts shall be sized to be a
minimum of 1 square inch per 2,000 Btu /hr.
Method 2..... One permanent opening communicating
directly with the outdoors via a horizontal duct. This
opening/duct shall be sized to be equal to 1 square inch
per 3,000 Btu / hr, but not less than the sum of the areas
all of the vent connectors in the confined space.
When installed as a direct vent furnace and NOT using the
concentric vent kit CVK-00 option, the combustion air is to
be terminated in the following manner;
IO-213D
OPTIONAL
INLET
SCREEN
If the optional concentric vent kit (CVK-00) is used, follow
the instructions provided with this accessory.
SOURCE OF COMBUSTION AIR
The recommended source of combustion air is to use the
outdoor air supply. However, the use of indoor air in most
applications is acceptable except as follows;
1. If the furnace is installed in a confined space, the
necessary combustion must come from outdoors by
way of the attic, crawl space, or direct opening to the
outside.
2. If indoor combustion is used, there must be no exposure
to the substances listed in #3 below.
3. The following installations may require OUTDOOR AIR
for combustion, due to chemical exposures;
• Commercial buildings
• Buildings with indoor pools
• Furnaces installed in laundry rooms
• Furnaces installed in hobby or craft rooms
• Furnaces installed near chemical storage areas
Exposures to the following substances in the combustion
air supply may also require OUTDOOR AIR for combustion;
• Permanent wave solutions
• Chlorinated waxes and cleaners
• Chlorine based swimming pool chemicals
• De-icing salts or chemicals
• Carbon tetrachloride
• Halogen type refrigerants
• Cleaning solvents (such as perchloroethylene)
• Printing inks, paint removers, varnishes, etc.
• Hydrochloric acid
• Cements and glues
• Antistatic fabric softeners for clothes dryers
• Masonry acid washing materials

VENTING

ANNUAL inspections of the furnace and it's vent / combustion
air supply is strongly recommended. It is the contractor's
responsibility to inform the user of this importance. All venting
shall be in accordance with Part 7; Venting of Equipment,
of the National Fuel Gas Code, ANSI Z223.1, or applicable
local building and/ or air conditioning codes.
PROPER INSTALLATION OF THE VENT / COMBUSTION AIR
SYSTEMS IS CRITICAL TO SAFE OPERATION OF THIS
APPLIANCE. CAREFULLY READ AND UNDERSTAND THE
INSTRUCTIONS IN THIS SECTION. EACH VENT AND
COMBUSTION AIR SUPPLY PIPE MUST SERVE ONLY ONE
5
COMBUSTION
AIR INTAKE
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