Hörmann is a leading US residential and commercial garage door manufacturer. It makes garage doors crafted from wood, steel, and polyethylene for architects, builders, and homeowners. Its commercial doors range from light to heavy duty; they are impact, abrasion, and weather resistant and also offer insulation. Hörmann's garage doors are used in replacement, remodeling, and new construction work. The company operates manufacturing facilities in Illinois and Pennsylvania supported by four distribution centers throughout the US. It also sells its products through a nationwide network of dealers. The company was originally founded as General Aluminum Company in 1961.