PreVent screens are flexible, vinyl-edged equipment protection air filter screens that capture airborne particulates at the outdoor air intakes before they can enter your HVAC system. They are custom-designed to fit the exact perimeter of any outdoor air intake, PreVent is UV protected, has a five year warranty and has a variety of design features which allow the filters to be attached easily and securely. The greatest feature is the magnetic fasteners that hold the screen filters in place. No holes need to be drilled and naturally the magnets can be moved and adjusted to make sizing modifications.