Atomic X6670 Lennox Compatible Merv 11 Filter Media 16X25X5 Fits X6660 HCC16-28 - 2 Pack MERV 11 Actual Size: 15-3/4" X 24-3/4" X 4-3/8" 2 Filters Nominal Size: 16" x 25" x 5" Manufactured by Atomic - Made in the USA