Super-Cowl Scoop-Mini 39" Long,16-1/4 Wide, 7" High, Inside Mounting Flange, Front Opening 3-1/4 x 11-1/2, Rear Opening 2 x 16

AC-539: Front & Rear open! Features "open back" for forcing air into rear. Aero-scoop allows air to enter front, greatly improving performance! 24" width is an approx. of inside clearance & does not include the flange. Sides taper; 24-1/2" at midpoint.