18-GJ89D1-1E-EN
17
Ducted and Non-Ducted Return Applications
Table 4. Non-Ducted Applications
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pprrooppeerrttyy ddaammaaggee oorr ppeerrssoonnaall iinnjjuurryy..
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ccoonnddiittiioonneedd ssppaaccee aanndd eeqquuiippmmeenntt ddaammaaggee ccaann
rreessuulltt.. DDoo nnoott iinnssttaallll aann aaiirr hhaannddlleerr wwiitthh aa nnoonn--
dduucctteedd rreettuurrnn iinn tthhee ssaammee cclloosseett,, aallccoovvee,, oorr uuttiilliittyy
rroooomm aass aa ffoossssiill ffuueell ddeevviiccee..
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 clearances to
combustible materials and service access must be observed (see
outline drawing).
• This area may also be used for other purposes, 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.
Supply Duct
Plenum
Accessory with
Safety Guard
Non-Ducted
Return
Table 5. Ducted Return Installations.
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 access must be observed (see outline
drawing).
Supply Duct
Return Duct
Ducted
Return
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