U.L.rated for dynamic closure, for use in a 2 hours (781 Model) or 4 hour(781-3 Model) wall or partition. Meets NFPA 90A, UL555 & UL555S. Suitable for 2000 FPM | 4″ W.G.
STANDARD CONSTRUCTION:
FIRE RATING
781 : 1 ½ hr
781-3: 3 hrs
Leakage
Class-1 250ºF
Class- 11 350ºF
FRAME: 4-5/16″ deep, 16 gauge galvanized steel
BLADES: 6 ½” wide, double wall 20 gauge galvanized steel in airfoil shape, equivalent to a 14-gauge single skin blade.
(Bottom blade width may vary depending on damper height)
BLADE AXLES & BEARINGS
Axles – 7/16″ Plated hex Mechanically fastened to blade
Bearings – Bronze oil impregnated
LINKAGE: Plated steel in opposed blade configuration, concealed inside the jamb. Operator shaft ½” Steel rod
SEALS: Extruded silicone blade edge and stainless steel jamb seals
MAXIMUM UL CLASSIFIED
Single section assemblies:
781 – 32″W x 48″ H Vertical
781 – 3 -32″W x 48″H Vertical
MULTIPLE SECTIONS:
Multiple section assemblies: (made of sections no longer than above sizes)
781 (128″ x 96″) vertical or horizontal mount
781-3 (60″ x 72″ max.) vertical mount
Minimum UL Classified Leakage class 1 size
12″W x 8″H
Sleeve
18 ga. x 16″ deep galvanized steel
Undersized
1/4″ under ordered size unless specified Exact or Actual
Finish
Mill
Actuator Mounting
Standard : Outside
Optional: Inside (Consult Manufacturer)
Optional Construction
Heat Sensor
165ºF standard. 212ºF, 250ºF, or 350ºF(optional)
Specified MAterial – Available in stainless steel
