Can pressurized for d10n

Does anyone know of a kit for an aftermarket pressurized for the cab? The cab has new windows and good door seals but still manages to get dirt on the wrong side of the filters. They have checked the system best they can for leaks and can't really find anything. It can get pretty bad especially since no one blows the cab out or the AC system on a regular basis. I'm trying to find some info on an aftermarket kit to help eliminate this problem. I have searched some but can't find anything...

Can pressurized for d10n

Can pressurized for d10n