11-28-2007, 05:51 PM
[quote decocritter]What is the plenum?
When facing the front of my unit (part that has a removable Goodman panel)... The main furnace gas jets are on the left, filter slide next, and a big tin chute (which I think is return air from looking at where it branches off to)
Yes, that is the air return. Air flows from that into the furnace. Even simpler, like Pat said, just point the arrow on the filter toward the furnace.
If you still have your old filter (and remember how it was installed), then the dirty side is where the air flows from.
When facing the front of my unit (part that has a removable Goodman panel)... The main furnace gas jets are on the left, filter slide next, and a big tin chute (which I think is return air from looking at where it branches off to)
Yes, that is the air return. Air flows from that into the furnace. Even simpler, like Pat said, just point the arrow on the filter toward the furnace.
If you still have your old filter (and remember how it was installed), then the dirty side is where the air flows from.