The Model 1000 commercial sheet metal door is easy to install and provides tremendous value. Many components are pre-assembled and are made of high quality materials. Brackets, gears, chains, and a tensioner are all in place, which makes this door a solid investment for commercial or industrial applications. General and more specific features of the door can be found below: • A drum wheel that is 9 ½” in diameter • Maximum opening size of 12’ wide by 14’ high (168 sq.ft.) • A reduced, right-hand-only chain hoist • Push-up, hand chain, and internal electric operations