20” x 25” x 4” Filters
Filtrete 20x25x4 Air Filter MERV 11, MPR 1000 Micro Allergen Defense 2-Pack, AC Furnace HVAC Filters for Home
This is a great option for those who want extra filtration, have pets, or struggle with seasonal allergies. The MERV 11 rating indicates heavy-duty filtration capabilities.
Simply 20x25x4 Air Filter, MERV 8, 4 Pack, Furnace Air Filter for HVAC Dust, Pet, & Allergy Control
Great price for a 4-pack with limited filtration capabilities. This is the option for you if you want the lowest level of protection that still provides use.