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•
Chlorinated waxes and cleaners
•
Chlorine based swimming pool chemicals
•
Water softening chemicals
•
Deicing salts or chemicals
•
Carbon Tetrachloride
•
Halogen type refrigerants
•
Cleaning solvents (such as perchloroethylene)
•
Printing inks, paint removers, varnish, etc.
•
Hydrochloric acid
•
Cements and glues
•
Antistatic fabric softeners for clothes dryers
•
Masonry acid washing material
N N o o t t e e : : Extended warranties are not available in
some instances. Extended warranty does not
cover repairs to equipment installed in
establishments with corrosive atmospheres,
including but not limited to, dry cleaners,
beauty shops, and printing facilities.
Minimum Free Area in Square Inches Each Opening (Furnace
Only) in a Confined Space
Furnace Max
Air From
BTUH.Input
Inside
Rtg.
40,000
100
60,000
100
80,000
100
100,000
100
120,000
120
140,000
140
(a) 1 Square inch per 4000 BTU/hr Vertical Duct.
(b) 1 Square inch per 2000 BTU/hr Horizontal Duct.
CONFINED
LESS THAN 50 CU. FT.
PER 1000 BTU/HR INPUT
ALL EQUIP. INSTALLED
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. Refer to the Minimum Free Area in
square inches for confined spaces table, for minimum
open areas required.
S9V2-VS-SVX001-1C-EN
Air From Outside
Vertical Duct
Horizontal
(a)
Duct (b)
10
20
15
30
20
40
25
50
30
60
35
70
FURNACE
F F u u r r n n a a c c e e G G e e n n e e r r a a l l I I n n s s t t a a l l l l a a t t i i o o n n
CONFINED SPACE
AIR FROM INSIDE BUILDING
CONFINED
SPACE
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. Refer to the Minimum
Free Area in square inches for confined spaces table,
for minimum open areas required.
CONFINED SPACE
AIR FROM OUTDOORS
CONFINED
SPACE
CONFINED SPACE
AIR FROM VENTILATED ATTIC/CRAWL SPACE
CONFINED
SPACE
ALTERNATE
INLET AIR
CONFINED SPACE
AIR FROM VENTILATED ATTIC
CONFINED
SPACE
PERMANENT
OPENINGS
OUTLET
OUTDOOR
AIR DUCTS
INLET
ATTIC LOUVERS
TO OUTDOORS
OUTLET
AIR
INLET
AIR DUCT
ATTIC LOUVERS
TO OUTDOORS
OUTLET
AIR
INLET
AIR DUCT
47
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