Brand: Nasta (NASTA) ・Ventilation fan cover with filter KS-8690PFN-SG ・Sound absorbing insulation material for Polette, Gray L KS-KD8690 New, unused, set of 2 Compatible size: Please check the image. 【Product Description】 Simply attach it over your ventilation opening to cut off dust and pollen from the outside. The filter removes approximately 80% of dust and pollen. (Over 90% removal of cedar pollen) To replace the filter, simply remove the cover and peel off the filter inside. In strong winds such as typhoons, you can remove the cover and attach it upside down to prevent wind from blowing in. Body material: ABS resin. Dimensions: 238mm wide x 238mm long x 46mm deep. Color: White Accessories: 4 gypsum board pins. Installation may not be possible if the ventilation opening is less than 40mm away from the wall or ceiling.