Labeled Entrances

Early in its history, Columbia was issued Underwriters Laboratories label procedures for drywall entrances and doors. In 1985, Columbia tested its 9' high drywall entrance assembly at UL's Northbrook, Illinois facilities and was issued a new expanded label procedure; in 1993, tested for 10', allowing for unlimited opening sizes and transom heights, in any permutation, and for the issuance of Oversize Certificates.

Want to see if your entrances would receive UL labels or Oversize Certificates? You can find out, in 7 questions or less, by clicking on Certification.

UL Test