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MI Windows and Doors is one of the largest manufacturers of vinyl, aluminum and cellular windows and doors in the country. You can count on our nationwide footprint for delivering and manufacturing superb products, and you can count on our people to build a quality relationship that you can depend on. If the heart of MI is our people, then the strength of MI is our products. As the single source for windows and doors, our Capitol, BetterBilt and Cellular Collection brands provide reliable new construction products. Capitol Architectural Products serve a wide range of commercial architecture, and our XACT replacement windows boast energy efficiency and easy installation. MI's extraordinary control over our manufacturing process is a distinct competitive advantage. Our time-tested relationships with suppliers ensure quality raw materials, while our control over the manufacturing process ensures high quality products. At MI, we're committed to every product, as well as every customer. We're behind every door. We're behind every window.