they are not in the stores! and I have a absolutely normal Trane furnace :(
Thats a indeed odd size.... If you can't find them in stores, you may want to try a local HVAC inform on, and if they can't help you... I'd try to modify it to a normal size such as 20 x 20...... Most machinery stores sell a cheap green filter that looks
I cannot always find a 4" thick ooze, is there a downside to using 4 1" filters? I am using three filters of selfsame density, and one of a much thicker density (i.e. filters smaller particles) in assumption (least to most dense).
5. Generic Honeywell Furnace Air Ooze HWP20254 FC100A1037 FC200E1037 -- 5 Pack (5 filters) - MERV 11 pre-signal.amazon.com 4. 3M Filtrete 6-Pack ...
Learn how to make restitution for or clean your air filter.
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20 x 25 x 4 Merv 12 (Instance of 6) 
20 x 25 x 4 Merv 12 (Chest of 6) Furnace Air Filt Reviews