ISi North America AMV8 User Manual download pdf (Page 9)

(b) Equipment shall be installed in a location in which the

facilities for ventilation permit satisfactory combustion of

gas, proper venting and the maintenance of ambient

temperature at safe limits under normal conditions of use.

Equipment shall be located so as not to interfere with

proper circulation of air. When normal infiltration does not

provide the necessary air, outside air shall be introduced.

be provided as required for: cooling of equipment or

material, controlling dew point, heating, drying, oxidation or

dilution, safety exhaust, odor control, and air for

compressors.

(d) In addition to air needed for combustion, air shall be

supplied for ventilation, including all air required for comfort

and proper working conditions for personnel.

(e) While all forms of building construction cannot be covered

in detail, air for combustion, ventilation and dilution of flue

gases for gas utilization equipment vented by natural draft

normally may be obtained by application of one of the

methods covered in 5.3.3 and 5.3.4.

(f) Air requirements for the operation of exhaust fans, kitchen

ventilation systems, clothes dryers, and fireplaces shall be

considered in determining the adequacy of a space to

provide combustion air requirements.

5.3.2 Equipment Located in Unconfined Spaces:

In unconfined spaces (see definition below) in buildings,

infiltration may be adequate to provide air for combustion

ventilation and dilution of flue gases. However, in buildings

of tight construction (for example, weather stripping, heavily

insulated, caulked, vapor barrier, etc.), additional air may

need to be provided using the methods described in 5.3.3-

b or 5.3.4.

Space, Unconfined.

For purposes of this Code, a space whose volume is not

less than 50 cubic feet per 1,000 BTU per hour of the

aggregate input rating of all appliances installed in that

space. Rooms communicating directly with the space in

which the appliances are installed through openings not

furnished with doors, are considered a part of the

unconfined space.

5.3.3 Equipment Located in Confined Spaces:

(a) All Air from Inside the Building: The confined space shall

be provided with two permanent openings communicating

directly with an additional room(s) of sufficient volume so

that the combined volume of all spaces meets the criteria

for an unconfined space. The total input of all gas utilization

equipment installed in the combined space shall be

considered in making this determination. Each opening

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

BTU per hour of the total input rating of all gas utilization

equipment in the confined space, but not less than 100

square inches. One opening shall be within 12 inches of

the top and one within 12 inches of the bottom of the

enclosure.

Furnace

Water

Heater

Opening

Chimney or Gas Vent

Opening

NOTE: Each opening must have

a free area of not less than one

square inch per 1000 BTU of

the total input rating of all equip-

ment in the enclosure, but not

less than 100 square inches.

Equipment Located in Confined Spaces;

All Air from Inside Building. See 5.3.3-a.

(b) All Air from Outdoors: The confined space shall be provided

with two permanent openings, one commencing within 12

inches of the top and one commencing within 12 inches of

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.

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.

Furnace

Water

Heater

Outlet Air

Chimney or Gas Vent

NOTE: The inlet and outlet air

openings must each have a free

area of not less than one square

inch per 4000 BTU of the

total input rating of all equipment

in the enclosure.

Inlet Air

Ventilation louvers for

unheated crawl space

Alternate

air inlet

Ventilation louvers

(each end of attic)

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.

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ISi North America AMV8 User Manual Page 9

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