Five slot louver (cutout size is 3 5/8" x 12", overall size is 4 1/2" x 12 7/8") Eight slot louver (cutout size is 1 7/8" x 15 1/4" overall size is 2 7/8" x 16 3/8") Ten slot louver (cutout size is 3 5/8" x 19 7/8", overall size is 4 1/2" x 20 7/8")
Five slot louver (cutout size is 3 5/8" x 12", overall size is 4 1/2" x 12 7/8") Eight slot louver (cutout size is 1 7/8" x 15 1/4" overall size is 2 7/8" x 16 3/8") Ten slot louver (cutout size is 3 5/8" x 19 7/8", overall size is 4 1/2" x 20 7/8")