HQRP Foam and Felt Filter Kit for Shark Navigator NV36, NV36A Upright Vacuum Coaster HQRP Foam and Felt Filter Kit 4-Pack Replacement; 2 Foam Circular Filters, 1 Felt Circular Filter, 1 Felt Exhaust Filter; Do not operate the vacuum with wet filters; Before making a purchase please make sure your filter looks exactly like the one on the photo. If your original filter has a hole inside, our filter will not work with your vacuum cleaner. 2 weeks DOA replacement warranty!