CSA RA 350 - Installing Ducts; Inlet Air Duct; Discharge Duct

Form I-RA/D 350/500, P/N 131090R12, Page 17
Installing
Ducts
Inlet Air Duct
Canadian installations require eld installation of an inlet air duct (return
air system) on a Model RAD heater. The blower-equipped heater has an
inlet air duct ange. Inlet duct dimensions (inside) should be:
RAD350 RAD500
Height 36” (914mm) 35” (889mm)
Width 54-1/2” (1384mm) 58” (1473mm)
Slip the ductwork over the ange and attach using 1/2” long sheetmetal
screws.
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RAD
A B
inches mm inches
mm
350 54 1372 24-1/4
616
500 57-5/16 1456 20-7/16
519
Discharge Duct
A discharge duct may be attached to a Model RAD heater. To connect
the duct to the heater,
• Remove the louvers from the furnace.
• Field fabricate a duct transition as illustrated.
• Attach duct transition to the heater using 1/2” long sheetmetal
screws
IMPORTANT: Never reduce the furnace opening size
abruptly. Always use a tapered transition like the one
illustrated.