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Where can I find the air filter in a Lennox central air unit in the garage of a condo so I can change it?
I cannot seem to find it anywhere...I unscrewed the sheet metal from the front of the unit...There is nothing to unscrew on the sides or back...I changed the Humidifier filter without a problem, but cant find the central air filter.........Thanks...
Determine which duct is the Return (cold) air-- examine that. The air is filtered before being heated.
Filters are RARELY sealed in with screws... look for pull-handles or hand grasps along the duct.
Do you have an electrostatic
20x25x5 Lennox X6673 Replacement MERV 12 Pleated Furnace Air Filter Box of 4 - Manufactured by Nordic Pure: 20x2... 
20x25x5 Lennox X6673 Replacement MERV 12 Pleated Furnace Air Filter Box of 4 - Manufactured by Nordic Pure: 20x2... 
20x25x5 Lennox X6673 Replacement MERV 12 Pleated Furnace Air Filter Box of 4 - Manufactured by Nordic Pure: 20x2... 
20x25x5 Lennox X6673 Replacement MERV 12 Pleated Furnace Air Filter Box of 4 - Manufactured by Nordic Pure: 20x2... 
20x25x5 Lennox X6673 Replacement MERV 12 Pleated Furnace Air Filter Box of 4 - Manufactured by Nordic Pure: