• Cleaning solvents (such as perchloroethylene).
• Printing inks, paint removers, varnishes, etc..
• Hydrochloric acid.
• Sulfuric Acid.
• Solvent cements and glues.
• Antistatic fabric softeners for clothes dryers.
• Masonry acid washing materials.
ConfinedSpaceInstallation
NOTE: A confined space is defined as an area with less than 50
cubic feet(1.4m 3) per 1,000 BTUH input rating for all gas ap-
pliances installed in the area.
Requirements
1. Provide confined space with sufficient air for proper combus-
tion and ventilation of flue gases using horizontal or vertical
ducts or openings.
2. Figure 5 illustrates how to provide combustion and ventila-
tion air. A minimum oftwo permanent openings, one inlet and
one outlet, are required.
3.
4.
5.
One opening MUST be within 12" (300mm) of the floor and
the second opening within 12" (300mm) of the ceiling.
Size openings and ducts per Table 1.
Horizontal duct openings require 1 square inch(25sq, mm) of
free area per 2,000 BTUH of combined input for all gas ap-
pliances in area (see Table 1).
6. Vertical duct openings or openings directly to outside require
1 square inch (6.5mm 3) of free area per 4,000 BTUH for com-
bined input of all gas appliances in area (see Table 1).
Air Openingsand ConnectingDucts
1. Total input rating for all gas appliances MUST be considered
when determining free area of openings.
2. Connect ducts or openings directly to outside.
3. When screens are used to cover openings, the openings
MUST be no smaller than 1/4" (Cmm) mesh.
4. The minimum dimension of rectangular air ducts MUST NOT
be less than 3" (75mm).
5. When sizing grille or louver, use the free area of opening. If
free area is NOT stamped or marked on grill or louver, as-
sume a 20% free area for wood and 60% for metal.
One permanent opening, commencing within 12" (30 cm) of the
top of the enclosure, shall be permitted where the equipment has
clearances of at least 1" (2.5 cm) from the sides and back and 6"
(16 cm) from the front of the appliance. 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, and shall have a mini-
mum free area of:
• t sq. in per 3000 Btu per hr (7cm2 per kW) ofthe total input rating
of all equipment located in the enclosure, and
• Not less than the sum of the areas of all vent connectors in the
confined space.
Outside Air (This is ONLY a guide. Subject to codes of country having jurisdiction.)
This installation NOT approved in Canada
._ _ _ -Optional Inlet Air (1)
Soffit Vent
II
Inlet
Air (1)
MinimumOne Inlet and OneOutletAirSupplyis Required
May bein andCombinationShown
InletAir OpeningMustbe Withint2"(300mm)of floor
OutletAirOpeningMustbe Withint2"(300mm)of ceiling
(1) 1SquareInch(Ccm2) per4000BTUH
12)1SquareInch IOcm2}per2000BTUH
I ' ' n so%lit ent
°t'etAirl''II L
I _ .LI. II I Outlet
i N iii
t'l I I I _ _ Air(2)
Inlet
Air (t)
_] 44t 01 2308 01
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