• These intake pre-filters are two and three-ply (dry, dry tackified and light tackified) graduated density panel filters. They provide full depth loading for low pressure drop and long filter life. This multi-stage construction offers inexpensive protection for high cost final filters. Pre-filter panels are available in single panels, links and custom designed to fit any paint spraybooth. The Viskon-Aire application guide will provide the proper part number for your spraybooth.