COUNTERBALANCED ASSEMBLY
Steel pipe barrel of size capable of carrying curtain load with maximum deflection of 0.03″ per ft. of door width. Heat treated helical torsion springs encased in a steel pipe and designed to include an overload factor of 25% to ensure minimum effort to operate. Sealed and pre-lubricated ball bearings at rotating support points. A charge wheel for applying initial spring torque and for future adjustment. Also available in stainless steel or hot dipped galvanized.

OPTIONAL 
High Cycle Springs designed to satisfy 30, 40, 50, 60, 70, 80, and 90m life cycles. Extra high cycle, 100m and up consult Engineering.

BRACKETS
Steel plate not less than 3/16″ thick. Ball bearing at rotating support points. Bolted to guide wall angle extension, supports counterbalance assembly and forms end enclosures

HOOD HEXAGON
(Square or Round Optional) #24 gauge galvanized steel. Formed to fit contour of brackets. Intermediate supports as required to prevent excessive sag. Also available in stainless steel.

GUIDES 
Guides are designed using structural steel angles with a minimum thickness of 3/16″, expansion slotted connections, and removable bellmount curtain stops to allow for curtain maintenance without removal of guides. Bellmount stops shall be flush with guide groove.

OPERATION
Push-up, hand chain, hand-crank, or motor operation. (for optional features see motor operators section in this catalog)

LOCKING
Equip doors for latching by slide bolts. Motor doors with locks will void the Guarantee.

FINISHES
(Optional) Finish on steel to be shop coated primer, except on galvanized surfaces (on stainless steel, #2B, #4B, #7B polished or mill finish). Call for color options and finishes.

COMPLIANCE 
The curtain jamb guides will meet ASTM A-36 and ASTM A-123 specifications. The curtain will comply with ASTM E 84 specifications. The hood will comply with ASTM A-653. The electric door operators will comply with NFPA 70. 

*Conforms to and with all applicable ASTM Testing Methods.