Design Features – U.L. rated for dynamic closure, Model D-175 is a 1-1/2 hour fire damper, Model D-175-3 is a 3 -hour fire damper.Meets NFPA 90A and UL 555.
STANDARD CONSTRUCTION
FRAME : 4-5/16” deep, 16 gauge galvanized steel
BLADES: 6” wide, 16 gauge galvanized steel
(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 conguration, concealed inside the jamb.
FUSIBLE LINK: 165°F (73°C) standard – (others available)
MAXIMUM SIZE UL CLASSIFIED
36” w x 48” h – 175 (1-1/2 hour rated) (Vertical and Horizontal)
36” w x 36” h – 175-3 (3 hour rated) (Vertical and Horizontal)
MINIMUM SIZE UL CLASSIFIED
8” w x 6” h
UNDERSIZED: 1/4” under ordered size unless specied Exact or Actual
FINISH: Galvanized
OPTIONAL CONSTRUCTION
SPECIFIED MATERIAL – Available in stainless steel
SLEEVE AND DUCTWORK CONNECTION – 10 ga. to 20 ga. galvanized steel to 30” in length. Transitions available in: round, oval, rectangular or custom. Factory can install access door, retaining angles, flange connections, or security bars.
* Dampers 11” (279) high and under will be single blade, and extend from the frame proportionately
