Trane S9X1 - Page 61

S9XB-SVX001-1D-EN
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RETURN AIR FILTERS FOR FURNACE IN HORIZONTAL
CONFIGURATION
When the 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, refer to
Figure 4, p. 61 or the filters may be installed in the duct work
upstream of the furnace, refer to
Figure 5, p. 61.
Filter kits are available for horizontal applications.
Note: Direct coupled side returns are not allowed to the blower
cabinet.
Figure 4. Remote Filter Installation
Remote Filter Grille
Remote Filter Grille
Figure 5. Duct Filter Installation
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TYPICAL DOWNFLOW FURNACE RETURN AIR FILTER
INSTALLATIONS
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.
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”
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