GSW 5065 manual U.S. Installations, Burn Hazard, Do not touch vent, Doing so can result in, burns

Confined 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 confined spaces; all air

CONFINED

UNCONFINED

from inside the building.

SPACE

Two permanent openings shall be provided connecting

SPACE

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

unconfined space. Each opening shall have a free area

EQUIPMENT LOCATED IN CONFINED SPACES;

of one square inch per 1,000 BTU/hour input (22

ALL AIR FROM INSIDE THE BUILDING.

cm²/kW) of all appliances in the confined space, but not

less than 100 square inches (645 cm²). The top open-

(b)

COMBUSTION

PERMANENT

300mm

VENTILATION

ing shall commence within 300mm (12 in.) of the top of

AIR DUCT

(12 in.)

AIR.

space and the bottom opening shall commence within

300mm

300mm (12 in.) of the bottom of the enclosure.

(12 in.)

ABOVE

GRADE

(b) Basement installation, equipment located in

CONFINED

OR

confined spaces; all air from outdoors.

SNOW

SPACE

LINE

When supplying air directly from the outdoors, each

GRADE

opening shall have a minimum free area of one square

inch per 4,000 BTU/hour input (5.5 cm²/kW) of total

input rating of all appliances in the confined space. The

BASEMENT INSTALLATION, EQUIPMENT LOCATED

inlets shall be a minimum of 300mm (12 in.) above the

300mm

grade (snow) line. The top opening shall commence

IN CONFINED SPACES; ALL AIR FROM OUTDOORS

(12 in.)

within 300mm (12 in.) of the top of the confined space.

(c)

OUTDOORS

(c) Equipment located in confined spaces; all

AIR DUCT

air from outdoors.

300mm (12 in.)

When supplying air directly from the outdoors using hor-

izontal ducting, each opening shall have a free mini-

mum area of one square inch per 2,000 BTU/hour (11

cm²/kW) of total input rating of all appliances in the con-

fined space.

CONFINED

VENTILATION

COMBUSTION

SPACE

(d) Equipment located in confined spaces; all

air from outdoors through ventilated attic.

When supplying air directly through vertical ducting,

EQUIPMENT LOCATED IN CONFINED

each opening shall have a free minimum area of one

300mm (12 in.)

SPACES; ALL AIR FROM OUTDOORS.

square inch per 4,000 BTU/hour (5.5 cm²/kW) of total

input rating of all appliances in the confined space.

(d)

ATTIC LOUVERS TO OUTDOORS

OUTLET

AIR

INLET AIR

DUCT

CONFINED

SPACE

300mm (12 in.)

Burn Hazard

Do not touch vent.

EQUIPMENT LOCATED IN CONFINED 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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