Bgears BG01381 90mm Fan Filter - 2pk. Keep your case clean and protect it from debris by installing some of our Bgears 90mm Fan Filter Dual Pack. The pack comes with a fan filter to protect from dust and fan grill to keep small debris out of your case to protect your precious components.Bears Fan Filter 90mm 2 Pieces Pack. Fan filter is design to mount on the fan as a fan guard to protect and prevent dust from entering into the Computer system and to prolong the lifespan and performance of a fan by preventing the dust from clogging the fan blades and the fan motor. Each Bears Fan Filter consist of 3 parts; Top Filter cover, Washable Filter, Bottom Filter cover. Each Pack consist of 2 pieces of Fan Filter. Customer Service: Supportatbgears.com or call 510-657-7252. RMA Service: RMAatbgears.com or call 510-657-7252.