HEPA filter for purifier Q34FA and other similar purifiers. It consists of 3 layers: a photocatalytic titanium filter layer, a high-efficiency HEPA non-woven layer, and activated carbon. The first layer of the filter captures dust and hair in the air. The HEPA filter class H10 removes airborne dust particles PM 2.5 and smoke. The honeycomb-structured carbon filter absorbs and decomposes formaldehyde, phenol, smoke, and mold. dimensions: 34x27x2cm