HDX 20 in. x 30 in. x 1 in. Allergen Plus Pleated Furnace Air Filter FPR 7, MERV 1 HDX1P7-012030 - The Home Depot
Wingman1 Electronic Air Filter with 1-Yr Supply of Air Purifier Pads - HVAC, Heater, Air Return, Furnace Filters for House - Air Conditioner Replacement Filters - Easy Homeowner Installed - 16x20x1 - Amazon.com
Frigidaire PureAir® 16x20x1 MERV 8 Allergen Electrostatic Pleated Air Conditioner HVAC AC Furnace Filters - 6 Pack - Amazon.com