Maytag H675NRRS Operations Instructions download pdf (Page 15)

Instructions for Installation (cont'd)

Combustion Air and Ventilation

for Appliances Locatedin

Confined Spaces (cont'd)

b. ALL AIR FROM OUTDOORS: (see Figures 3-5) 3. When communicating with the outdoors through horizon-

The confined sp_ce shall be provided with two permanent tal ducts, each opening shall have a minimum free area of 1

openings, one commencing within 12 inches of the top square inch per 2,000 BTU per hour of total input rating of

and one commencing within 12 inches from the bottom of all equipment in the enclosure. (See Figure 5.)

the enclosure. The openings shaUcommunicate directly, or

by ducts, with the outdoors or spaces (crawl or attic) that

freely communicate with the outdoors.

F_ure 5

[ Figure 3 I

4. When ducts are used, they sha]] be of the same cross-sec-

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

connect. The minimum short side dimension of rectanguiar

1. When directly communicating with the outdoors, each air ducts shall not he less than 3 inches. (See Figure 5.)

opening shall have a minimum free area of 1 square inch

per 4,000 BTU per hour of total input rating of all equip- 5. Louvers and Grilles: In calculating free area, consideration

ment in the enclosure. (See Figure 3.) shall be given to the blocking effect of louvers, grilles or

screens protecting openings. Screens used shall not be

2. When communicating with the outdoors through vertical smaller than % inch mesh. If the free area through a design

ducts, each opening shall have a minimum free area of i of louver or grille is known, it should be used in calculating

square inch per 4,000 BTU per hour of total input rating of the size opening required to provide the free area specified.

all equipment in the enclosure. (See Figure 4.) 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 wiI1have 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.

6. Special Conditions Created by Mechanical Exhausting or

Fireplaces: Operation of exhaust fans, ventilation systems,

clothes dryers or fireplaces may create conditions requiring

-Figure ] special to unsatisfactory operation

4 attention avoid of

installed gas utilization equipment.

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Maytag H675NRRS Operations Instructions Page 15