18x30x1 Boair 5-Stage Electrostatic Washable Ac Furnace Filter,Boair,BA-18301" /> Replaces 18x30x1 disposable air conditioner filters Electrostatic, Washable, Permanent Filter 5-Stage Electrostatic Filter Media Non-Rusting Aluminum Frame, Lifetime Warranty 40+ Sizes available - see our other listings