Product details:

Outside dimension 21in x 27in depth 2. 175in. Net free venting area is 57 sq in with a rough opening of 8in x 8in. Locking positions 0. 75in 1. 00in 1. 25in and 1. 50in. Snap-on trim ring wide nailing flange leveling lines and adjustable stop gauge for easy installation. Double baffle system for weather protection. Sealed-in fiberglass screen for defense against insects and animals. Gable vents designed to be installed prior to siding application. Product cannot be painted. Made in the USA.