Fires do occur in telephone exchange buildings around the world. The effects of these fires and the smoke they create can leave local exchanges disabled for hours or even days. Superl has trained professionals to install the proper firestopping systems around cable racks, trays, inner duct fiber-optic and telephone cables to provide required hourly ratings. email info@superl.net Corporate Headquarters 7301 Apollo Court, Lino Lakes, MN 55014 Phone: (763) 571-7464 Fax: (763) 571-7646