Mini-pleated microfine media assembled into multiple minipleat media packs bonded to an all plastic enclosing frame. The Durafil ES 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 Durafil is guaranteed to maintain its published efficiency throughout the life of the filter and provide the higest energy savings and longest life of any filter in its class.