American Air Filter 222-863-051 24" X 24" X 1" Dust Shield Air Filter (12 Pack)American Air Filter 222-863-051 24" X 24" X 1" Dust Shield Air Filter (12 Pack) Features:The Dirt Demon model offers the best value in high efficiency residential filtersMade with AAF"s patented, self supported mediaDust Shield pleated filters are 15 times more effective as compared to fiberglass disposable filtersNew technology eliminates the need for metal reinforcement, allowing for an effective filter with greater handling safetyLasts for up to 90 days24" x 24" x 1"