GSW 319594-000 manual U.S. Installations, Local Codes, Burn Hazard, Do not touch vent, burns

Ventilated Space Air Requirements for

(a)

U.S. Installations

Refer to Figure 5 (a), (b), (c) or (d) for proper sizing and

location of combustion air ducts and openings. CHECK

PERMANENT

LOCAL CODES.

OPENINGS

a) Equipment located in ventilated spaces; all air from

VENTILATED

UNCONFINED

inside the building.

SPACE

Two permanent openings shall be provided connecting

SPACE

to ventilated space (e.g. closet, small room) with the

unconfined space. Each opening shall be equal or

EQUIPMENT LOCATED IN VENTILATED

greater than 645cm2 (100 in2.) with a width to height

SPACES; ALL AIR FROM INSIDE THE BUILDING.

ratio of 2:1. The top opening shall be located close to

the ceiling.

(b)

VENTILATED

COMBUSTION

PERMANENT

300mm

VENTILATION

Note: The opening shall not be lower than the top of the

SPACE

AIR DUCT

(12 in.)

AIR.

heater. The location of the bottom opening shall be 150-

300mm

450mm (6-18 in.) above floor level.

(12 in.)

ABOVE

GRADE

b) Basement installation, equipment located in ventilated

OR

SNOW

spaces; all air from outdoors.

LINE

Refer to the latest edition of the "National Fuel Gas

GRADE

Code" ANSI Z223.1 for air supply duct sizes and

restrictions.

c) Equipment located in ventilated spaces; all air from out-

BASEMENT INSTALLATION, EQUIPMENT LOCATED

300mm

doors.

IN VENTILATED SPACES; ALL AIR FROM OUTDOORS

(12 in.)

Refer to the latest edition of the "National Fuel Gas

Code" ANSI Z223.1 for air supply duct sizes and

(c)

OUTDOORS

restrictions.

AIR DUCT

300mm (12 in.)

d) Equipment located in ventilated spaces; all air from out-

doors through ventilated attic.

Refer to the latest edition of the "National Fuel Gas

Code" ANSI Z223.1 for air supply duct sizes and

restrictions.

VENTILATED

VENTILATION

COMBUSTION

SPACE

Note: Ensure sufficient ventilation air to prevent elevat-

ed temperatures in closets and ventilated spaces.

When an exhaust fan is installed in the same room as the

EQUIPMENT LOCATED IN VENTILATED

water heater, the supply air openings must be of sufficient

300mm (12 in.)

SPACES; ALL AIR FROM OUTDOORS.

capacity to prevent a backflow of air through the water

heater exhaust venting.

(d)

ATTIC LOUVERS TO OUTDOORS

OUTLET

AIR

INLET AIR

DUCT

VENTILATED

SPACE

300mm (12 in.)

Burn Hazard

Do not touch vent.

EQUIPMENT LOCATED IN VENTILATED SPACES; ALL

AIR FROM OUTDOORS THROUGH VENTILATED ATTIC.

Doing so can result in

Figure 5 Combustion Air Supply Openings And Ducts

burns.

(U.S.A.)

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