Glasfloss Industries HWP20254M112PK Z-Line Series 400 HW MERV 11 Air Cleaner Replacement Filter Option, 2-Case Replacement option for Honeywell F-100 Air Cleaner Filter MERV 11 Performance 100% Synthetic Media Made in the USA Heavy Duty Moisture-Resistant Construction (Honeywell is a registered trademark of Honeywell Products, Inc.)