18x24x4 MERV 11 Pleated AC Furnace Air Filters. 3 Pack

Glasfloss ZL 18x24x4 MERV 10 ( FPR 6-7 ) AC and Furnace Pleated 4" Inch Air Filters. Quantity 4. Exact Size: 17-1/2 x 23-1/2 x 3-3/4"

Glasfloss ZL 18x24x4 MERV 11 ( FPR 7 ) Pleated AC Furnace Air Filters. 2 Pack. Exact Size: 15-1/2 x 24-1/2 x 3-3/4