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18-CE07D1-1C-EN
Table 4. Return Duct Connections
Return Ducting General Guidelines
• Back returns are not allowed on any S-Series Furnaces
• Side returns are not allowed on downflow or horizontal S-Series
Furnaces
• Mounting flanges must be located on ducting
• Shoot screws through the mount flanges into the furnace cabinet
• Always seal per local codes and requirements
• Furnace, coil, and ducting must be supported separately
• An external overflow drain pan must be installed in all applications
over a finished ceiling to prevent property damage
• Minimum return air is 55
o
F and maximum is 80
o
F.
Upflow Furnace with Bottom Return in Closet with Remote
Filter
1. Remove the bottom plate.
2. Set the furnace on the base inside closet.
3. Install remote filter.
4. Seal per local codes and requirements.
Upflow Furnace with Bottom Return in Closet with Filter Box
1. Remove the bottom plate.
2. Set the furnace on the filter box inside closet.
3. Must have grille present for air.
4. Seal per local codes and requirements.
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