TopTech TechPure TT-FM-2020 QB OEM Replacement Filter - QwikBox(R) New QwikBox(R) Collapsed Design That Is Easy To Assemble Prior to Installation MERV 11 TopTech TechPure OEM Original Equipment Replacement Air Filter Fits TechPure TT-MAC-2122 & TT-MAC-2020 Air Cleaners Actual Size 19.375" x 19.375" x 3.75"