Amana GUI Installation Instructions Manual page 6

Figure 2
Equipment Located in Confined Spaces;
All Air from Outdoors—Inlet Air from
Ventilated Crawl Space and Outlet Air to
Ventilated Attic. See 5.3.3-b
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.
(See Figure 3)
Figure 3
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 equipment in the enclosure.
(Figure 4)
*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 5.3.3-b.
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.
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 Ex-
hausting 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.
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Figure 4