??Size?Total size: 120mmx120mmX9mm/5"x5"X0.35" (L*W*H); Hole Center: 105mm/4.1"; Diagonal Hole Center: 148mm/5.8"; Hole Diameter: 5mm/0.2" ??Specification?Protection Level: IP40; Sponge Purity: 40PPI;Dust Removal Rate: 89%; Package Weight: 281.9g; Package Content: 4x Computer Dustproof Filters. ??3 in 1 dust filter?There are 3 layers of protective channels. In the middle is the sponge, which can block the fine dust particles. The overall dust filter is up to 89% to ensure the normal use of the cooling fan. ??Function?The dustproof filter can keep the PC or PC components clean, and at the same time reduce the noise of the fan to a certain extent, and more importantly, it can extend the life of the fan. ??Application?Computer fan filter is suitable for home computer chassis fan dust, speaker grilles dust protection.(Suitable for 120mmx120mm home computer cooling fan.)