Reliant FVIR GAS WATER HEATER Bedienerhandbuch PDF herunterladen (Seite 12)

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

calculating the size 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 be 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.

FIGURE 14.

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.

FIGURE 13.

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 (11 cm

/kW) of total input

rating of all equipment in the enclosure, see Figure 14.

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 short side dimension of

rectangular air ducts shall not be less than 3” (76.2 mm),

see Figure 14.

5. Louvers and Grilles: In calculating free area, 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 (6.4 mm) mesh. If the free area through

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Reliant FVIR GAS WATER HEATER Bedienerhandbuch Seite 12