BEST rolling metal fire doors are constructed in strict accordance with Underwriter's laboratories specifications.

FURNISH: Every Rolling steel fire door is manufactured by Best Rolling Manufacturer, bears Underwriter's Laboratories Class labels.

OPERATION: Choose from Manual, Hand Chain Hoist or Electric Motor Operator.

CLOSING MECHANISM: The standard fire door will close automatically after a fusible link is subjected to 165°F. 

CURTAIN: Is constructed of interlocking galvanized steel slats in 20 U.S. gauge. They're fitted with steel or malleable iron endlocks or windlocks riveted to each slat.  This prevents curtain shifting and excessive wear on surfaces between the guides.

BOTTOM BAR: Tough curtain rigidity is added to the bottom bar with steel angles.

COUNTER BALANCE ASSEMBLY: Is a custom engineered permanently lubricated torsion spring assembly enclosed in a structural steel pipe of sufficient diameter and wall thickness so deflection will not exceed .03" per foot of door width.  The self closing mechanism is activated by fusible links or solenoid release.

BRACKETS: Minimum 3/16" thick - to contain the counterbalance assembly and rolled curtain.

GEAR ASSEMBLY FOR HAND CHAIN HOIST DOORS: Canimex Governor Device or high quality gray iron cast gears from machine cut patterns.

GUIDES AND MOUNTING ANGLES: Are designed to meet the door's specific engineering requirements.

HOOD: Is formed of  galvanized sheet metal not lighter than 24 gauge and formed to fit end brackets.

LOCKING: Choose slide bolts on bottom bar, chain lock, or self locking on motor operated doors.

FINISH: All non-galvanized surfaces (except fraying surfaces) are coated with our rust inhibiting metal primer.