DEMCiflex Computer Air Filter is the easiest of all Computer Air Filters to use. No need for any skills. No Glue, No Screws, No Tools and No Hassles. The medical grade high precision mesh used as filtering medium is very unique in that while it stops dust from entering it allows air through virtually unrestricted. DEMCiflex is the only Computer Dust Filter that will keep out certain sized particles and larger. No claim by filters that use foam or other material can do this because of its composition. Our standard filters are optimized to stop as much dust as possible without negatively influencing the air-flow. These Fan Filters Are Very Simple To Use.All you have to do is:1. Locate your computer\'s air intake vents. 2. Use a sheet of paper to see if any particular fan draws air into the case or blows it out. 3. Attach the magnetic fan fiilter to the correct side of the fan.All inlet fans and un-fanned openings can be protected by DEMCiflex.NOTE: If you are concerned about the affect that the magnetic strip might have on any of your devices like Flashdrives or hard drives we assure you that in tests that was carried out over a period of 18 months no data was lost or corrupted by it\'s presence. The magnetic strip has a pulling power of only 200 gauss. That is only strong enough to keep the lightweight DEMCiflex filter attached to the case.