I had a Coleman TG8S 3ton drive single stage 1200 cfm furnace plus a matching 3.5 ton coil and a consenser 3 ton installed the furnace called for a 16x25 filter. There is no internal filter so we installed a external filter cabinet in the return. The external filter cabinet can take a 1" or 2" thick filter obviously both 16x25.
What are the pros and cons of a 2" thick filter? what would happen if i put two 1 inch filters in the cabinet? would i get reduced air flow or better filtration? should i just stick with a 1" filter?
Edit: I'm using a standard merv 8 pleated filter