Category I Venting (Verticalventing) - Goodman GMH8 Installation Instructions Manual

*Iftheappliance room is located a gainst anoutside w all a ndthe
airopenings communicate directly w ith theoutdoors, each opening
shall h ave a freearea ofnotlessthanonesquare i nch per4,000
BTUperhourof thetotalinputrating of all appliances in the
enclosure.
4.When ducts areused, t hey shall b eofthesame cross-
sectional area asthefreearea oftheopenings towhich
theyconnect. Theminimum dimension of rectangular
airducts shall n otbelessthan3 inches.
NOTE: The single opening must have
a free area of not less than one
square inch per 3000 BTU of
the total input rating of all equip-
ment in the enclosure
the sum of the areas of all vent
connectors in the confined space.
Ch mn_y or Gas Vent
Opening
_ A[tern_e
Opening
LocatEon
Equipment Located in Confined Spaces; All Air from Outdoors.
Single Air Opening. See 5,3.3-b.
5. One permanent opening may be permitted, provided the
equipment has clearances of at least 1" from the sides
and back and 6" from the front. The opening shall
communicate directly with the outdoors and must be
located within 12" of the top of the enclosure. The
minimum free area of the opening shall be 1 square
inch per 3,000 BTU per hour of total input rating of all
equipment in the enclosure. The minimum free area
shall not be less than the sum of the areas of all vent
connectors in the confined space.
5.3.4 Specially Engineered Installations:
The requirements of 5.3.3 shall not necessarily govern when
special engineering, approved by the authority having
jurisdiction, provides an adequate supply of air for combustion,
ventilation, and dilution of flue gases.
5.3.5 Louvers and Grilles:
In calculating free area in 5.3.3, consideration shall be given
to the blocking effect of louvers, grilles or screens protecting
openings. Screens used shall not be smaller than 1/4 inch
mesh. If the area through a design of louver or grille is known,
it should be used in calculating the size of opening required
to provide the free area specified. If the design and free area
is not known, it may be assumed that wood louvers will have
20-25 percent free area and metal louvers and grilles will
have 60-75 percent free area. Louvers and grilles shall be
fixed in the open position or interlocked with the equipment
so that they are opened automatically during equipment
operation.
5.3.6 Special Conditions Created by Mechanical Exhausting or
Fireplaces:
Operation of exhaust fans, ventilation systems, clothes dryers,
or fireplaces may create conditions requiring special attention
to avoid unsatisfactory operation of installed gas utilization
equipment.
Vl. CATEGORY I VENTING (VERTICAL VENTING)
I AWARN'NG
To
PREVENT POSSIBLE PERSONAL INJURY OR DEATH DUB TO ASPHYXIATION,
THIS FURNACE MUST BE CATEGORY _ VENTED. Do NOT VENT USING
CATEGORY I II
VENTING.
Category I Venting is venting at a non-positive pressure. A furnace
vented as Category I is considered a fan-assisted appliance and
the vent system does not have to be "gas tight." NOTE: Single
stage gas furnaces with induced draft blowers draw products of
combustion through a heat exchanger allowing, in some instances,
common venting with natural draft appliances (i.e. water heaters).
All installations must be vented in accordance with National Fuel
Gas Code NFPA 54/ANSI Z223.1 - latest edition. In Canada, the
furnaces must be vented in accordance with the National Standard
of Canada, CAN/CSA B 149.1 and CANICSA B 149.2 - latest editions
and amendments.
NOTE: The vertical height of the Category I venting system must
be at least as great as the horizontal length of the venting system.
_'_ WARNING
To
PREVENT POSSIBLE PERSONAL INJURY OR DEATH DUE TO ASPHYXIATION,
COMMON VENTING WITH OTHER MANUFACTURER'S INDUCED DRAFT APPLIANCS
IS NOT ALLOWED.
The minimum vent diameter for the Category I venting system is
as shown:
MINIMUM VENT
MODEL
UPFLOW COUNTERFLOW
45 4 Inch 4 Inch
70 4 Inch 4 Inch
90 4 Inch 4 Inch
1!5 5 Inch 5 Inch
140 5 Inch N/A
Under some conditions, larger vents than those shown above
may be required or allowed. When an existing furnace is removed
from a venting system serving other appliances, the venting system
may be too large to properly vent the remaining attached
appliances.
Upflow or Horizontal units are shipped with the induced draft
blower discharging from the top of the furnace. ("Top" is as viewed
for an upflow installation.) The induced draft blower can be rotated
90 degrees for Category I venting. For horizontal installations, a
four inch single wall pipe can be used to extend the induced draft
blower outlet 1/2" beyond the furnace cabinet. Vent the furnace in
accordance with the National Fuel Gas Code NFPA 54/ANSI Z223.1
- latest edition. In Canada, vent the furnace in accordance with
the National Standard of Canada, CAN/CSA B 149.1 and CAN/CSA
B149.2 - latest editions and amendments.
Venting
THIS FURNACE IS NOT DESIGN CERTIFIED TO BE
HORIZONTALLY VENTED.
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