![APPENDIX](/images/new-backgrounds/35211/3521139x1.webp)
APPENDIX
COLD AIR RETURN
FILTER BOX
INSTALLATION A
TO EXISTING
DUCT WORK
WARM AIR
EXISTING
FURNACE
MODEL 1321
FURNACE
NOTE:
INSTALL
NOTE:
COMBINED STATIC PRESSURE IN OUTLET PLENUM MUST NOT EXCEED 0.25 INCHES WATER COLUMN WITH BOTH FURNACE'S FANS RUNNING.
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