The package contains 2 Foam Circular Filters, 1 Felt Circular Filter, 1 Felt Exhaust Filter. Do not operate the vacuum with wet filters. The vacuum uses all 4 filters at once. It's recommended to wash the circular foam and felt filters every 30 days, and replace it after 3-4 washes, and replace woven exhaust filter every 6 months.
!!! The models NV42, NV36, NV36A can be supplied with different 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.