VEVOR Protective Pre Filters, 5 Pack, 15.75'' x 15.75'' Air Filter Replacement, High-efficient Stage 1 Filters Compatible w/ BlueDri & VEVOR Scrubber, Air Purifiers, Water Damage Restoration Equipment

This product's primary filter is rated G4.

This product has three filters, one of which is H13.

It is G4.

Protective Pre Filters, 5 Pack, 15.75'' x 15.75'' Air Filter Replacement, High-efficient Stage 1 Filters Compatible w/BlueDri & VEVOR Scrubber The grade of high-efficiency filter is H13, and the size is 483*404*50. The primary filter is G4 grade, size 400*400*20 The activated carbon filter is G4 grade, size 400*400*20