Feature●HEPA filter designed specifically for commercial use●Fits: dri-eaz defend air HEPA 500 machines●Premium filter that meets or exceed OEM filter efficiency●This is a Janitized replacement part●Part Number F321●This is an aftermarket of generic partDescription Janitized jan-hvac140 premium replacement HEPA filter designed to fit dri-eaz defend air 500. Oem # F321 (1 filter)