Standard Tools W153-CASE - Paint Booth Tacky Intake Filters 20" x 20" Intake filters are as important to a great paint job as the booth itself. The intake filters are the primary defense against foreign particles landing on the painting surface. These intake filters are constructed of a 1/2" dry air entering layer and a 1/2" leaving air layer with non-migrating super tack. Clean Filters = Clean Air! Intake filters should be changed when they appear dirty or every 100 hours of booth usage. Its quick and easy to change out your paint booth filters. As an easy reminder to change out your intake filters, always keep some in stock so you have them when you need them. UL Class II rated. Internal galvanized steel frame with two crossbars make these filters sturdy and self-supporting. Case of 20 - 20" x 2-" Intake Filters to the continental 48 states