High efficiency box filter with lofted microfine media guaranteed to maintain efficiency throughout the life of the filter.

Microfine high loft media pleated into deep pleats, bonded to an all-metal enclosing frame with diagonal support members maintaining pleat stability. 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.