Kenmore 33176 Installation Guide download pdf (Page 13)

FIGURE 12.

• When communicating with the outdoors through vertical

ducts, each opening should have a minimum free area of

1 square inch per 4,000 BTU per hour (5.5 cm

/kW) of

total input rating of all equipment in the enclosure, see

Figure 12 on page 11.

• When communicating with the outdoors through horizontal

ducts, each opening should have a minimum free area

of 1 square inch per 2,000 BTU per hour (11 cm

/kW) of

total input rating of all equipment in the enclosure, see

Figure 14.

• Alternatively a single permanent opening may be used when

communicating directly with the outdoors, or with spaces that

freely communicate with the outdoors. The opening should

have a minimum free area of 1 square inch per 3,000 BTU

per hour (8.3 cm

/kW) of total input rating of all equipment in

enclosure. See Figure 13.



• When ducts are used, they should be of the same cross-

sectional area as the free area of the openings to which they

connect. The minimum short side dimension of rectangular

air ducts should not be less than 3 inches (76.2 mm), see

Figure 14.

FIGURE 14.

• Louvers and Grilles: In calculating free area, consideration

should be given to the blocking effect of louvers, grilles or

screens protecting openings. Screens used should not

be smaller than 1/4 inch (6.4 mm) mesh. If the free area

through a design of louver or grille is known, it should be

used in calculating the size opening required to provide

the free area specied. If the design and free area is not

known, it may be assumed that wood louvers will be 20-25

percent free area and metal louvers and grilles will have

60-75 percent free area. Louvers and grilles should be

xed in the open position or interlocked with the equipment

so that they are opened automatically during equipment

operation.

• Special Conditions Created by Mechanical Exhausting or

Fireplaces: operation of exhaust fans, ventilation systems,

clothes dryers or replaces may create conditions requiring

special attention to avoid unsatisfactory operation of

installed gas utilization equipment.

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Kenmore 33176 Installation Guide Page 13

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