5848 N. 95th Ct.
Milwaukee, WI 53225

About ASI

Marathon High Speed, High Performance Door Systems

• Designed to eliminate the need for high wear parts.
• No roller wheels, belts, cables or extension springs to replace.
• Doors open and close within seconds.
• Available in custom sizes colors and styles including insulated or fenestrated grille style slats.
• Marathon Doors are made in the U.S.A.

Marathon, a division of ASI Doors, Inc. has been producing fast, reliable high performance doors since 1965.

GSA Contract Holder #: GS0-7F-0813N

Competitors of ASI

DoorKing, Inc.

DoorKing, Inc.

DoorKing, Inc. (we are also known as “DKS”) was established in 1948 and is one of the country's leading manufacturers of telephone entry systems, vehicular gate operators, parking control products and access control systems in the United States. DoorKing was the first company to use... Read More

DeTect, Inc.

DeTect, Inc.

DeTect, Inc. specialises in applied, intelligent radar remote sensing technologies and systems for aviation safety, security and surveillance, environmental protection, renewable energy and environmental protection with over 500 radar systems delivered worldwide. DeTect's HARRIER security and... Read More

Designed Security, Inc.

For more than 35 years, DSI has developed custom and standard state-of-the-art security and access control solutions for corporate, commercial, government and industrial markets. With highly skilled personnel and a modern 13,000 square-foot facility in Bastrop, Texas, we perform all aspects... Read More