Flanders® Extended Surface Panel Filter, Pleated Filter, Synthetic Media, Board Frame, 18 in Width, 24 in Height, 1 in D, MERV: 10, 5.5 sq-ft Media Area, 13 Pleats per Linear Feet, 300 fpm, 500 fpm, 625 fpm Rated Velocity, 0.22 in-WG Initial Resistance, 1 in-WG Final Resistance, 900 scfm, 1500 scfm Air Flow Capacity, 23-1/2 in H x 17-1/2 in W x 3/4 in D Actual Size, 180 deg F