Filter Queen NON-OEM Defender 4000 HEPA Air Purifier Replacement Filter by GoodVac Filter Queen Non-OEM replacement HEPA filter by GoodVac For optimum performance, replace filter every 12 months. Fits Filter Queen models: Defender 4000, Rac4000, AM4000, Defender 360, 80th Anniversary, D360. Replaces Genuine Part No. 5404011300 and 4404009100. Measures approximately 8" H x 7 1/2" ID x 11 1/4" OD. HEPA filter is 99.97% effective at removing particles as small as .3 microns from the air that passes through the filter. Activated carbon absorbs odors and allergens, and keeps the air clean and pure.