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. All you have to do is to locate your computer's air intake vents. Use a sheet of paper to see if any particular fan draws air into the case or blows it out. All inlet fans and un-fanned openings can be protected by DEMCiflex.