28
A801X-SVX001-1A-EN
FURNACE
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.
CONFINED SPACE
AIR FROM INSIDE BUILDING
CONFINED
SPACE
PERMANENT
OPENINGS
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
OUTLET
OUTDOOR
AIR DUCTS
INLET
CONFINED SPACE
AIR FROM VENTILATED ATTIC/CRAWL SPACE
CONFINED
SPACE
ALTERNATE
INLET AIR
INLET
AIR DUCT
OUTLET
AIR
ATTIC LOUVERS
TO OUTDOORS
CONFINED SPACE
AIR FROM VENTILATED ATTIC
CONFINED
SPACE
INLET
AIR DUCT
OUTLET
AIR
ATTIC LOUVERS
TO OUTDOORS
