The FD-MB Series of static fire dampers is available in 1-1/2 & 3 hour ratings and carry listings with UL, ULC & California State Fire Marshal. The FD-MB Series of multibladed dampers are available in standard 3V blades as well as Airfoil shaped blades for superior pressure drop performance, and are acceptable for use in 'Fans Off' systems
Available with a full range of factory sleeves and duct transitions
Available with either 3V style blades (FD-MB-3V) or Airfoil Blade designs (FD-MB-AF).
True Round Model Available (FD-RD)
Front access and “out of wall” grille mount versions available (FD-OW)