Honeywell 28720 replacement filter for the Enviracaire model F112C6001, 61200, 41200, 17250. Inside the 21500 box is one hepa filter measuring 14-3/4 OD, 10-1/2 ID, 6" H.. This True HEPA filter lasts 1-3 years depending on conditions such as operating speed and duration. Genuine Honeywell, as shown in photo.
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