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Maintain a 1-in. clearance from combustible materials to supply air
ductwork for a distance of 36 in. horizontally from the furnace. See
NFPA 90B or local code for further requirements.
For a furnace not equipped with a cooling coil, the outlet duct shall
be provided with a removable access panel. This opening shall be
accessible when the furnace is installed and shall be of such a size
that the heat exchanger can be viewed for possible openings using
light assistance or a probe can be inserted for sampling the air
stream.
DUCTWORK ACOUSTICAL TREATMENT
Installation tip: Metal duct systems that do not have a 90 degree
elbow and 10 ft of main duct to the first branch take-off may
require internal acoustical lining. As an alternative, fibrous duct-
work may be used if constructed and installed in accordance with
the latest edition of SMACNA construction standard on fibrous
glass ducts. Both acoustical lining and fibrous ductwork shall
comply with NFPA 90B as tested by UL Standard 181 for Class 1
Rigid air ducts.
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Fig. 14—Duct Flanges
A02329
UPFLOW
OWNFLOW
HORIZONTAL
PREFERRED
PERMITTED
PREFERRED
PREFERRED
PREFERRED
120˚
MIN
PREFERRED
120˚
MIN
PREFERRED
120˚
MIN
90˚
90˚
PERMITTED
PERMITTED
D
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Fig. 15—Horizontal Unit Suspension
A02345
1
/
4
" THREADED ROD
4 REQ.
SECURE ANGLE
IRON TO BOTTOM
OF FURNACE WITH
3 #8 x
3
/
4
" SCREWS
TYPICAL FOR 2 SUPPORTS
1" SQUARE, 1
1
/
4
" x 1
1
/
4
" x
1
/
4
" ANGLE IRON
OR UNI-STRUT MAY BE USED
(2) HEX NUTS, (2) WASHERS & (2) LOCK WASHERS
REQ. PER ROD
8" MIN FOR DOOR
REMOVAL
OUTER DOOR
ASSEMBLY
12