UTICA BOILERS JE Installation Manual download pdf (Page 9)

Important Vent-Piping Note: Sloped vent pipe at

least 1/4” for every 1’ to the vent terminal.

Provide combustion and ventilation air in accordance

with the section “Air for Combustion and Ventilation”,

of the National Fuel Gas Code, ANSI Z223.1/NFPA 54,

or applicable provisions of the local building codes.

Boiler is located in unconned space in building or

conventional construction frame, masonry or metal

building, inltration normally is adequate to provide air

for combustion and ventilation. However, if equipment

is located in building of tight construction (See National

Fuel Gas Code, ANSI Z223.1), boiler area should be

considered as conned space. If there is any doubt,

install air supply provisions in accordance with latest

revision of National Fuel Gas Code.

Boiler is installed in unconned space, in building of

tight construction, air for combustion and ventilation

must be obtained from outdoors or from spaces freely

communicating with outdoors. Permanent opening

or openings having total free area of not less than 1

square inch per 5,000 Btu per hour of total input rating

of all appliances shall be provided. Ducts may be used

to convey makeup air from outdoors and shall have

same cross-sectional area of openings to which they

are connected.

When air for combustion and ventilation is from inside

buildings, conned space shall be provided with two

permanent openings, one starting 12 inches from top

and one 12 inches from bottom of enclosed space. Each

opening shall have minimum free area of 1 square inch

per one thousand (1000) Btu per hour of total input

rating of all appliances in enclosed space, but must

not be less than one hundred (100) square inches.

Openings must freely communicate directly with other

spaces of sufcient volume so combined volume of all

spaces meets criteria for unconned space. Figure 1.

When boiler is installed in conned space and all

air is provided from outdoors conned space shall

be provided with one or two permanent openings

according to methods A or B (see page 10). When

ducts are used, they shall be of same cross sectional

area as free area of area of openings to which they

connect. Minimum dimension of rectangular air ducts

shall be not less than 3 x 3 inches or 9 square inches.

Vent-Piping

Combustion

Air

Openings

Combustion Air supplied from

inside the building

Vent-Piping

Combustion Air

Openings with

Motorized Dampers

Combustion Air supplied from

outside the building

VENTILATION AND COMBUSTION AIR

Figure 1 Figure 2

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 35 36

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UTICA BOILERS JE Installation Manual Page 9

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