whole house furnace filter assembly

Honeywell 20x25x4 filter housing and MERV11 filter higher capacity for dust capture summer for AC or winter. used what other suppliers call a 5" filter nominal 4-1/2". only need to change once or twice a year, 5 times the air flow of a better quality 1" filter and far superior dirt removal than a fibreglass filter most contractors instal. $100 New never used