14" x 6", Two Way Vent, Are Reversible For Either Stucco Or Siding Applications, Galvanized Steel Frame With 1/4" Mesh, 4 Half Punched Nail/Screw Guide Holes Provided At All 4 Corners, Designed Primarily For Vents Where Wall Studs Or Ceiling Joists Are 16" On Center, Rough Opening: 14" x 5-1/2", Flange With 7/8" Reveal For Stucco Applications Or Flush Mount For Retro Or Siding Applications.