17x26x4 MERV 11 Lennox Replacement Filters

Lennox H/C X6664 MERV 10 Air Filter Replacement Specifications: MERV 10 rating Replaces the Lennox 75X74 Dimensions: 17" x 26" x 4" (Actual Size: 16.625" x 26" x 4" ) Replace every 6 months for optimal results Reduces airborne particles down to 0.3 microns