Nispira premium HEPA filter replacement compatible with Filtrete HEPA-Type Room Air Purifier Filter size F1. Filter size dimension: 12 x 6.75 x 1.75 inches. 2 Filters included. This product is high quality aftermarket filter produced by Nispira. 3M Filtrete is a trademark or registered trademark of its respective holder. Use of it does not imply any affiliation with or endorsement by the holder. The trademark holder is not affiliated with Nispira and does not endorse this product. Any use of the name Filtrete or model designation for this product is made solely for purposes of demonstrating compatibility.