Trane S8B1A040M3PSC Installation, Operation And Maintenance Manual page 41

F F u u r r n n a a c c e e G G e e n n e e r r a a l l I I n n s s t t a a l l l l a a t t i i o o n n
RETURN AIR FILTERS FOR FURNACE IN HORIZONTAL
CONFIGURATION
When the modular blower is installed in the horizontal configuration,
Figure 1. Remote Filter Installation
the return air filters must be installed exterior to the modular blower
cabinet. Remote filter grilles may be used for homeowner
convenience, refer to Figure 1, p. 41 or the filters may be installed in
the duct work upstream of the modular blower, refer to
Figure 2, p. 41.
Filter kits are available for horizontal applications.
Note: Direct coupled side returns are not allowed to the blower
cabinet.
Figure 2. Duct Filter Installation
S8XB-SVX001-1B-EN 41