air filters. Permatron is also the leading designer of air filter screens. PreVent filter screens work as pre-filters for use on outside and inside air intakes, catching debris.... Plastic, leaves and debris gets blown around, contaminating coils and electrical components on a continuous basis. Installation of PreVent filter screens on the air intakes took only 10... into an air inlet can cause shorts in the machines computer boards, causing expensive repairs. PreVent Model R is an innovative air intake filter with a magnetic attachment adhered...