Utica Gas-fired Boiler User Manual download pdf (Page 6)

the other within 12 inches from the bottom of

the enclosure. The openings shall communicate

directly, or by ducts, with the outdoors or spaces

(crawl or attic) that freely communicate with the

outdoors. One of the following methods must

be used to provide adequate air for ventilation

and combustion.

1. When directly communicating with the

outdoors, 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. (Figure 2)

CH MNEY

VENTLAT ON LOUVERS

(EACH ENDQF ATTIC:}

OUTLET/ J

AIR

VENTFIPE

............... VENTLATIOn

LOUVEnSFort

IFGORE21

2. When communicating with the outdoors by

means of 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

appliances in the enclosed space. (Figure 3)

CHIMNEY

VFNT LAT ON LOUVERS

(EACH END OF ATTIC} ....

[]ZI } i IZ] _ZZZIiZiZZZI i IZ] IZZZI LZI i !

3. If horizontal ducts are used, each opening

and duct shall have a minimum free area 1

square inch per 2,000 BTU per hour of total

input rating of all appliances in the enclosed

space. (Figure 4)

CHIMNEY

GAS VENT

i • y" i_ii

".......ii ii

i!i}!}i}i}iEJ}i:}iii!iiiiii}!iiiiiiii¸:}i!}i}i}i}i:}ii{¸i¸i!!i¸ii! iiii!i!!iiiiiE!i}iiikfi!!¸U}:}i!}:::i

B. One permanent opening, commencing within

12 inches of the top of the enclosure, shall be

permitted where the equipment has clearances

of at least 1 inch from the sides, 1 inch from the

back, and 6 inches from the front of the boiler.

The opening shall directly communicate with

the outdoors or shall communicate through a

vertical or horizontal duct to the outdoors or

spaces (crawl or attic) that freely communicate

with the outdoors. The openings must have a

minimum free area of I square inch per 3000 Btu

per hour of the total input rating of all equipment

located in the enclosure. The free area must

be no less than the sum of the areas of all vent

connectors in the confined space.

6. In calculating free area using louvers, grilles or

screens for the above, consideration shall be given

to their blocking effect. Screens used shall not be

smatter than 1/4 inch mesh. If the free area through

a design of louver or grill 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 have 20-25% free area and metal louvers and

grilles will have 60-75% free area. Louvers and grilles

should be fixed in the open position or interlocked

with the boiler so they are opened automatically

during the boiler operation.

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Utica Gas-fired Boiler User Manual Page 6

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