The Permanent Pre-Filter has a black screen-like filter that has two tabs on the front. When placing this filter into the filter case, make sure that all tabs are snapped accordingly.
*Based on 24/7 operation and average indoor air qualityCompatible with:
Size of Product:14.75"W x 15.44"H inchesWeight:0.16 lbs
*Includes all MinusA2 Special Editions