AFB Bronze MERV 6 13x21.5x1 Pleated AC Furnace Air Filter. Pack of 4 Filters. 100% produced in the USA. 13x21.5x1 pleated ac furnace air filters. Perfect for home or business use. Each purchase is for a pack of 4 filters that can replace any standand furnace or air conditioning filter. Note the actual dimensions of this filter are 12 7/8 x 21 1/2 x 3/4". Note this is a custom filter made to order by AFB in the USA MERV rating of 6. Basic pleat that filters pollen, mold, and dust. AFB is a leading manufacturer of air filters, made in a US factory using 100% US components and shipped direct to your door. AirFilterBuy: Breathe Better!