Envion 18.5 In. H X 5.25 In. W Rectangular Hepa Air Purifier Filter

Envion 18.5 in. H X 5.25 in. W Rectangular HEPA Air Purifier Filter, keep your Therapure 240 Air Purifier running at its peak efficiency by replacing the filter every 6-9 months or sooner if needed. Easy to replace. HEPA type powerful triple filtration system removes up to 99.97 percent of airborne particles as small as 0.3 microns.