(4) HUNTER 30940 Purification Air Filter, ($25.00 each), (4) Carbons, (8) Pre-filters,High Tech 4 Stage Filter, FREE SHIPPING .........generic 4 Stage Filter with 2 filtration system Made in USA Complete filter with carbon and prefilter Captures up to 99.9% of contaminates in air 12 month life with replacement prefilter ($1.25)