Economical, 3-ply MERV 7, UL Class 1 panel filter. For use in commercial buildings, hospitals, industrial plants, and paint spray booths. Link Panels - Koch Maxi-Grid Panels are also available linked in a continuous series of panels for installation into side access filter housings. MG Link Panels allow for quick and easy installation and removal of the filter from the channel as a single unit. Link Panels eliminate the possibility of air bypass caused by gaps between filters or gaps at the end of a filter track.