Our Glasfloss Z-Line Pleated SB Air filters offer the right combination of price and performance. These are commercial grade economy filters and utilize Kimberly Clark media with low pressure drop. We offer many sizes for any particular application including hard to find items. These Glasfoss air filters are rated at 3 months but may need to be changed more frequently based on environmental conditions. From pre-filters to primary air filters for computer room HVAC units, laboratories, hospitals the Z-Line SB Series Pleated Air Filters offer a solution for virtually every commercial, industrial and residential HVAC application.