RX4Cleanair.com offers replacement bag filters for Air King, Trion, Airflow Systems and multiple other OEMs in varying lengths and efficiencies. Bag filters are not cleanable and should be replaced per OEM guidelines. We recommend a search by dimensions since the same filter size can be used in numerous dust collectors. RX bag filters are compactly fitted 4 to a box; save yourself time and money and buy in quantities of 4! If you’re not sure which bag filter is right, you can shop by air cleaner model or give us a call or chat.