BQLZR Black 14cm 140mm PC Computer Chassis Fan Dustproof Filter Mesh Metal Strainer 14cm 140mm This durable PC Case Fan filter make your computer fan work longer and muter,the mainboard work better too. Fit the strainer on your computer case to prevent dust getting into the computer. Easy to take down and clean,pls do not use Alkaline liquid to clean this Filter Grill. Thinner Metal Wires Allows more air flow to pass through.