Filtrete 20-in W x 25-in L x 1-in MERV 13 1900 MPR Premium Allergen, Bacteria and Virus Electrostatic Pleated Air Filter in the Air Filters department at Lowes.com
Amazon.com: Kirkland Signature 2200 High Performance Furnace Air Filter, 20x20x1 (Pack of 4) : Everything Else
General] Made something similar as a general air filter for my house. Figured since I didn't have a flow hood, I'd beef it up a bit and make a broke boi one.
16x25x1 Merv 13 Allergy Elite Pleated AC Furnace Filter - Case of 6 - Atomic Filters
Filtrete™ High Performance Air Filter 1900 MPR UA00-4, 16 in x 20 in x 1 in - The Binding Source
Filtrete™ Healthy Living Maximum Allergen Filter, MPR 1900, 20 in x 20 in x 1 in | 3M Canada
Anyone have the inside scoop if Kirkland Furnace Filters are a permanent thing? : r/Costco
Kirkland Signature 2200 High Performance Furnace Filters 4-Pack 20 x 20 x 1" NIB | eBay
Kirkland Signature 2200 High Performance Furnace Filters, 4-pack | Costco
3M 2200 Series Filtrete 1" Filter, 4-pack | Costco