A952V-SVX001-1A-EN
65
If only the front of the furnace is accessible, it is
recommended that both supply and return air
plenums are removable.
3. When replacing a furnace, old duct work should be
cleaned out. Thin cloths should be placed over the
registers and the furnace fan should be run for 10
minutes. Don’t forget to remove the cloths before
you start the furnace.
4. TThhee hhoorriizzoonnttaall iinnssttaallllaattiioonn ooff tthhee uuppffllooww ffuurrnnaaccee
rreeqquuiirreess aann eexxtteerrnnaall ffiilltteerr sseeccttiioonn.. FFiilltteerr kkiittss aarree
aavvaaiillaabbllee ffoorr hhoorriizzoonnttaall aapppplliiccaattiioonnss..
Figure 3. Horizontal upflow furnace with side return
FILTER
CLOSE COUPLED (LESS THAN 36”)
RETURN (FILTER DIRECTLY BENEATH BOTTOM
SIDE RETURN) NOT RECOMMENDED DUE TO
NOISE CONSIDERATIONS. IF USED, SECURELY
ATTACH 1/2” MESH METAL HARDWARE CLOTH
PROTECTIVE SCREEN TO THE INSIDE BOTTOM
OF THE FILTER GRILL.
LESS THAN 36”
RREETTUURRNN AAIIRR FFIILLTTEERRSS FFOORR UUPPFFLLOOWW FFUURRNNAACCEE IINN
HHOORRIIZZOONNTTAALL CCOONNFFIIGGUURRAATTIIOONN
When the Upflow Furnace is installed in the horizontal
configuration, the return air filters must be installed
exterior to the furnace cabinet. Remote filter grilles
may be used for homeowner convenience or the filters
may be installed in the duct work upstream of the
furnace.
TTYYPPIICCAALL DDOOWWNNFFLLOOWW FFUURRNNAACCEE RREETTUURRNN AAIIRR
FFIILLTTEERR IINNSSTTAALLLLAATTIIOONNSS
Filters are not factory supplied for downflow furnaces.
Filter size needed will be dependent on type of filter
and CFM requirement. Filters must be installed
externally to the unit.
Table 26. Downflow Return Air Filters
Furnace Width Filter
Qty and Size
17 – 1/2” 2 – 14” x 20” x 1”
21” 2 – 16” x 20” x 1”
24 – 1/2” 2 – 16” x 20” x 1”
RReettuurrnn AAiirr FFiilltteerrss
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