Kele’s pleated filters with MERV 8 (Minimum Efficiency Reporting Value) and MERV 13 ratings are extremely durable and long lasting. The gradient density, 100% synthetic media is bonded to a expanded metal media support system, pleated and sealed in a double wall, high wet strength , beverage board frame, for superior strength and rigidity. The use of MERV 8 and 13 rated high efficiency filters meet requirements for LEED (Leadership in Energy and Environmental Design) credits per the U.S. Green Building Council (USGBC) LEED Rating System®