C.H.I. commercial overhead doors are constructed using the finest raw materials, produced by the hands of skilled craftsmen, customized with computer-aided precision, and delivered both on time and with care. Our entire line of 3200 Series overhead doors, from our insulated sandwich doors to our pan-constructed models, are specially engineered for extra durability to afford years of dependable operation – even in the most challenging industrial environments. When coupled with the insulating qualities of our sandwich style doors, C.H.I. Overhead Doors is your best choice for green sustainable buildings and LEED projects.