+3 Hepa Filter, 16X19X2 Hepa 500 & Triad AFD AC35A $143.17 In stock Quantity: 1 Add to Bag Product Details Hepa Filter, 16X19X2 Hepa 500 & Triad AFD Hepa Filter for DriEaz Hepa 500 and the Prochem Triad AFD. Save this product for later Favorite