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FIRE/SMOKE DAMPER AIRFOIL BLADE – MODEL 781 & 781-3 CLASS I *781 (1-1/2 HR.) RATED *781-3 (3 HR.) RATED


Download Product Catalogue for FIRE/SMOKE DAMPER AIRFOIL BLADE – MODEL 781 & 781-3 CLASS I *781 (1-1/2 HR.) RATED *781-3 (3 HR.) RATED

Features – U.L. rated for dynamic closure & leakage CLASS I @ 350oF (176°C) , for use in a 1-1/2 hour (781 Model) or 3 hour (781-3 Model) wall or partition. Meets NFPA 90A & UL555 & UL555S.

STANDARD CONSTRUCTION

FRAME: 4-5/16” (110) deep, 16 gauge (1.6) galvanized steel

BLADES: 6 1/2” (165) wide, double wall 20 gauge (1.0) galvanized steel in airfoil shape, equivalent to a 14-gauge (1.9) single skin blade. (Bottom blade width may vary depending on damper height)

BLADE AXLES & BEARINGS
AXLES – 7/16” (11) Plated hex mechanically fastened to blade
BEARINGS – Bronze oil impregnated

LINKAGE
Plated steel in opposed blade configuration, concealed inside the jamb.
Operator shaft is 1/2” (13) steel rod extending 4-1/2” (114) from damper side 16” deep sleeve

SEALS: Extruded Silicone blade seals and stainless steel jamb seals

MAXIMUM UL CLASSIFIED LEAKAGE CLASS I SIZES
Single section assemblies:
781 32”W x 48”H Vertical
32”W x 36”H Horizontal
781-3 32”W x 48”H Vertical
32”W x 36”H Horizontal

MULTIPLE SECTIONS:
Multiple section assemblies: (made of sections no larger than above sizes) 781(128” x48”) (3658 x 1219) vertical or horizontal mount
781-3 (32” x 48” max.) (813 x 1219)single section assembly only Available also in 128”w x 96”h (3658 x 2438) (Static Rated)

MINIMUM UL CLASSIFIED LEAKAGE CLASS ISIZE: 12”W x 8”H (305 x 203)

SLEEVE: 18 ga. x 16” (1.3 x 406) deep galvanized steel

UNDERSIZED: 1/4” under ordered size unless specified Exact or Actual

FINISH: Galvanized
HEAT SENSOR: 120 VAC, 165o(73° C) to 350o (176° C)

OPERATOR: Refer to UL approved actuator chart (Specify external or internal mounting)

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