Simple style with exceptional functionality. The Round Gable Vent is suited for a full range of siding materials, but creates an intricate look when ringed in stone or brick for a gorgeous fa?ade application. - Features Patented snap-on trim ring provides a beautiful finished appearance once the vent has been installed, hiding rough cuts and reducing installation time. Mid-America gable vents provide added architectural detail with their wood grain finish and sharp distinctive features. Installation is easy with our wide nailing flange, leveling lines, adjustable stop gauge and snap-on trim ring. - Dimensions 18" 22" 36"Venting Area: 18" vent 26 sq. in. 22" vent 54 sq. in. 36" vent 140 sq. in. - Rough Air Opening: 18" vent 5" x 6" 22" vent 7" x 8" 36" vent 12" x 12"Locking position: 18" vent 0", .25", .5", .75", 1.00",1.25" 22" & 36" vent .75", 1.00", 1.25", 1.5"Helpful Documents