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6.3 Non Ducted Applications
Non-Ducted Return Installations:
• Installation in a closet, an alcove, or a utility
room without a return duct requires the use
of a plenum accessory kit as it uses the area
space as a return air plenum. Minimum clear-
ances to combustible materials and service
access must be observed (see outline draw-
ing).
• This area may also be used for other purpos-
es, including an electric hot water heater, but
in no case shall a fossil fuel device be installed
and/or operated in the same closet, alcove, or
utility room.
• Review local codes to determine limitations if
the unit is installed without a return air duct.
Ducted Return
Non-Ducted
Return
Supply Duct
Plenum
Accessory
with safety guard
HAZARDOUS VAPORS! Do not install an air
handler with a non-ducted return in the same closet,
alcove, or utility room as a fossil fuel device. Hazard-
ous vapors can be distributed throughout the condi-
tioned space and equipment damage can result.
Ducted Return Installations:
• Installation in an attic, garage, or crawl space with
ducted supply and return air is appropriate. Minimum
clearances to combustible materials and service ac-
cess must be observed (see outline drawing).
6.4 Ducted Applications
Supply Duct
Return Duct
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