The Aerostar® Seal Frame is a holding frame this is used to hold individual filters. The Seal Frame can be used for new installations or upgrades of existing systems. It is designed for use with 1” filter up to 11-1/2” filters with our without pre-filters. Frames are used in any application where air filtration is needed. Holding frames shall be 3” deep, vertical supports for larger configurations for added strength and pre-punched to assure proper alignment.