Query: 18x18x1 air filter
Washable Permanent Electrostatic Air Filter (18x18x1) by Venti Tech – HVAC System Filter – Captures Particles for Healthier Home Environment – Increases Airflow, Reduces HVAC Stress
Filtrete 18x18x1, AC Furnace Air Filter, MPR 1500, Healthy Living Ultra Allergen, 6-Pack (exact dimensions 17.81 x 17.81 x 0.78)
Filtrete 18x18x1, AC Furnace Air Filter, MPR 1000, Micro Allergen Defense, 6-Pack (exact dimensions 17.81 x 17.81 x 0.81)
Aerostar 18x18x1 MERV 8 Pleated Air Filter, AC Furnace Air Filter, 6 Pack (Actual Size: 17 3/4"x17 3/4"x3/4")
Filtrete 18x18x1, AC Furnace Air Filter, MPR 300, Clean Living Basic Dust, 6-Pack (exact dimensions 17.81 x 17.81 x 0.81)
FilterBuy 18x18x1 Air Filter MERV 8, Pleated HVAC AC Furnace Filters (2-Pack, Silver)
Filterbuy 18x18x1 Air Filter MERV 8, Pleated HVAC AC Furnace Filters (4-Pack, Silver)
E-Z Flow Air Filter, MERV 4, 18 x 18 x 1-Inch, 12-Pack
Nordic Pure 18x18x1 MERV 12 Pleated AC Furnace Air Filters 6 Pack
Aerostar 18x18x1 MERV 13 Pleated Air Filter, AC Furnace Air Filter, 6 Pack (Actual Size: 17 3/4" x 17 3/4" x 3/4")
Flanders PrecisionAire 10255.011818 18 by 18 by 1 Flat Panel Heavy Duty Spun Glass Air Filter