Shark Navigator NV22L Foam and Felt Replacement Filter Kit 4-Pack by Crucial Vacuum. Replaces Shark Navigator Part # XF22. This replacement filter kit fits the following shark models: NV22, NV22C, NV22L, NV22LC, NV22P, NV22T, NV22Q, NV22W. If you have allergies, this filter kit is absolutely essential for Allergy Sufferers! 99.97% Allergen Filtration. Designed and Developed in the USA by Crucial Vacuum. Directions for Washing the Foam and Felt Filters: Remove the Foam and the Felt Filters from the Filter Holder. Rinse in lukewarm water until the water runs clear. Squeeze filters and let air dry for 24 hours before replacing; do not use hair dryer or other heating methods to dry. Insert the included replacement filters while others are drying. Note: DO NOT operate the vacuum without ALL the filters in place. DO NOT operate the vacuum with WET filters. All vacuum brand and model names are registered trademarks of vacuum manufacturer.