Basic info, ClimateMaster 27 gethermal 4 ton unit.
Currently comes with a slot for a 30" x 31" x 2" pleated filter. Which I don't use.
I have a return grill of 24"x30" in the house in which I use a 1"
Antimicrobial treated; dry tactified polyester media. Its AEGIS microbe shield not only eliminates the filter as a potential breeding ground for micro-organisms, it also controls airborne germs. replace every 30 days . Arrestance : 87% @ .50" w.g. Airflow: .09" w.g. @ 300 fpm
I have come to find out that a 4" or 5" thick pleated filter can fit into my current grill (as I have about 18" of space behind the current filter) (backs into a closet).
My thinking is that a 4" pleated filter is equivalent to a flat filter 'about' 3 to 4 times the same grill size as far as air flow is concerned?
Based on similar materials used in each filter.
If so...the filter that came with the unit (29x30x2) is effectively equivalent (air flow wise) to a flat (29x60x1) aprox?
If thats true then the square inch requirement for that 2" filter is aprox 1740sq in?
And my using a flat 1" filter 24x30x1 has 720 square inches. almost 2.5 times to small?
If I alter the size of my current grill to a 24x24 and use a 4" filter will I gain air flow? Aprox 2304 Sq inches?
I'm interested in doing the sheet metal alteration (for a common filter size) I just want to be sure I'm not choking (but hopefully improving) the appropriate air flow.