Fits APR Part Number CI100001/CI100002/CI100003/CI100006/CI100018/CI100020/CI100022/CI100025/CI100031/CI100033/CI100035/CI100039. Pleated cotton gauze filter.
APR RF100001 Replacement Filter for CI100001/02/03/06/18/20/22/25/31/33/35
APR RF100015 Replacement Intake Filter for CI100037
