Category I Venting (Vertical Venting) - Amana GUI Installation Instructions Manual

2. When communicating with the outdoors through vertical ducts,
each opening shall have a minimum free area of 1 square inch
per 4,000 BTU per hour of total input rating of all equipment
in the enclosure.
Chimney or Gas Vent
Water
Heater
Furnace
Equipment Located in Confined Spaces; All Air from Outdoors
Through Ventilated Attic. See 5.3.3-b.
3. When communicating with the outdoors through horizontal
ducts, each opening shall have a minimum free area of 1 square
inch per 2,000 BTU per hour of total input rating of all equip-
ment in the enclosure.
Chimney or Gas Vent
Outlet air duct
Water
Heater
Furnace
*If the appliance room is located against an outside wall and the air openings communicate
directly with the outdoors, each opening shall have a free area of not less than one square inch
per 4,000 BTU per hour of the total input rating of all appliances in the enclosure.
Equipment Located in Confined Spaces; All Air from Outdoors. See
4. When ducts are used, they shall be of the same cross-sectional
area as the free area of the openings to which they connect.
The minimum dimension of rectangular air ducts shall not be
less than 3 inches.
Ventilation louvers
(each end of attic)
NOTE: The inlet and outlet air
openings must each have a free
area of not less than one square
inch per 4000 BTU of the
total input rating of all equipment
in the enclosure.
Outlet Air
Inlet air duct
[ends 1 ft (300 mm)
above floor]
NOTE: The air duct openings
must have a free area of not
less than one square inch per
2000 BTU of the total input
rating of all equipment in the
enclosure*.
Inlet air duct
5.3.3-b.
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, but not less than
the sum of the areas of all vent
connectors in the confined space.
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 equip-
ment 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 spe-
cial engineering, approved by the authority having jurisdiction, pro-
vides 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 as-
sumed 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 Fire-
places:
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.
VI. CA VI. CA VI. CATEGO TEGO TEGO TEGOR R R R R Y I VENTIN Y I VENTIN Y I VENTING ( Y I VENTIN
VI. CA VI. CA TEGO Y I VENTIN
T
O PREVENT POSSIBLE PERSONAL INJURY OR DEATH DUE TO ASPHYXIATION,
C
THIS FURNACE MUST BE
C III
ATEGORY 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 combus-
tion through a heat exchanger allowing, in some instances, common
venting with natural draft appliances (i.e. water heaters).
10
Chimney or Gas Vent
Water
Heater
Furnace
G (VER G ( G ( VER VERTI VER TIC C C C C AL VENTIN TI TI AL VENTING) AL VENTIN AL VENTIN
G ( VER TI AL VENTIN
WARNING
I D
ATEGORY VENTED. O NOT VENT USING
Opening
Alternate
Opening
Location
G) G) G)
G)