Feature: 1. Tiny Aperture: The tiny aperture of PC chassis cooling dust filter can filter fine dust, effectively block dust and keep the chassis clean. Keep the indoor space in excellent and clean condition. 2. Fluent Airflow: The ventilation rate of FF filter is up to 65 percent, which makes the airflow fluent and the heat dissipation far better than ordinary filters. It can be used for home computer case fan, dust filter, speaker mesh cover and other electrical or electronic products to keep off dust. 3. Reserved Screw Holes Design: Fine cutting process and one piece non marking magnetic frame, reserved screw holes are convenient for installation of non ferrous metal shells; for micro curved surfaces, it can also be tightly adhered to, with excellent dustproof effect. 4. Sturdy Nylon Mesh: The toughness of the nylon material creates a strong resistance to pressure, better than other plastic mesh. Magnetic fan filter supports 90mm fan ventilation holes, convenient and thoughtful! 5. Easy Installation: The PC chassis cooling dust filter is easy to install, it can be easily mounted on the ventilation holes of the chassis or power supply. It can effectively keep off dust from entering while drawing in cool air. Specification: Item Type: PC Chassis Cooling Dust Filter Material: Nylon, Soft Magnet Size: Approx. 90x90mm / 3.54x3.54in Color: Black Scope of Application: Used for Power Supply, Fan Vents in PC Chassis. Package List: 5 x PC Chassis Cooling Dust Filter Note: Manual measurement please allow some error.