This category covers rolling steel fire doors, which consist of interlocking galvanized or stainless steel slats, bottom bar, wall guides, barrel assembly, automatic release device, governor, and counterbalance mechanism. The doors may be provided with a motor drive assembly that does not interfere with the manual or automatic (fusible link, other fixed temperature release, or a rate of rise temperature release) closing of the door.

Rolling steel fire doors are intended to be installed in accordance with ANSI/NFPA 80, "Standard for Fire Doors and Other Opening Protectives." Authorities Having Jurisdiction should be consulted before installation.

Rolling steel fire doors are intended to be installed in concrete and masonry walls, unless otherwise noted in the individual Classifications. The doors are intended to be installed in accordance with the installation instructions provided with each assembly.

Two types of Classification Marks are available for rolling steel fire doors based upon the size of the door. The maximum size of a rolling steel fire door that has been subjected to a fire test is intended for an opening not exceeding 152 sq ft in area, with no dimension exceeding 13 ft 6 in. Rolling steel fire doors intended for openings not exceeding 152 sq ft in area and with no dimension exceeding 13 ft 6 in. bear the "Rolling Steel Fire Door" Classification Mark.

Rolling steel fire doors exceeding these maximum dimensions and manufactured in compliance (except for size) with UL's requirements for design, materials and construction may bear a Classification Mark that includes the statement "Oversized Rolling Steel Fire Door." Oversized doors are not Classified as to temperature transmission. Prospective users should ascertain from the Authority Having Jurisdiction whether the assembly is acceptable for a specific location.

The bottom bar of rolling steel fire doors is subject to damage from everyday use and occasionally the damage warrants replacement of the bottom bar. When the Classification Mark is attached to the bottom bar, the following method is authorized for replacement of the bottom bar. When acceptable to the Authority Having Jurisdiction, the Classification Mark may be removed from the bottom bar and returned to the door manufacturer along with a request for a new bottom bar. The door manufacturer is authorized to provide a replacement bottom bar for field installation with a Classification Mark that reads "Replacement Part for Rolling Fire Door" or "Replacement Part for Oversized Rolling Fire Door." The Classification Mark also includes the UL symbol, the word "CLASSIFIED" above the UL symbol (as illustrated in the Introduction of this Directory), a serial number, and a fire rating equal to that of the original Classification Mark that was returned to the manufacturer.

The Classification Mark of Underwriters Laboratories Inc. on the product is the only method provided by UL to identify products manufactured under its Classification and Follow-Up Service. The Classification Mark covers the design and construction of the door, including the governor and automatic releasing mechanism. The Classification Mark for regular-sized rolling steel fire doors includes the UL symbol, the word "CLASSIFIED" above the UL symbol (as illustrated in the Introduction of this Directory), and the following additional information:

The Classification Mark for oversized rolling steel fire doors includes the UL symbol, the word "CLASSIFIED" above the UL symbol (as illustrated in the Introduction of this Directory), and the following additional information:

(1) 4, 3, 1-1/2 or 3/4

(2) 30 MIN - 250°F MAX, 30 MIN - 450°F MAX, 30 MIN - 650°F MAX, or no reference to temperature rise when the temperature rise exceeds 650°F at 30 min.

The UL Mark is generally attached to the bottom bar of the rolling steel fire door.