Microfine high loft media formed into tapered pockets bonded to steel pocket retainers and a galvanized steel leader. The Hi-Flo is available in MERV 11, 13, 14, 15, 16 with corresponding MERV-A values of MERV 11-A, 13-A, 14-A, 15-A, 16-A. The Hi-Flo is guaranteed to maintain its published efficiency throughout the life of the filter.