Fixed, one slot, one way plenum-slot supply diffusers with adjustable vertical down blow section shall be Anemostat Model FDB and Model FSRB combination supply-return assemblies as scheduled.  Outer frame type shall conform and integrate with the ceiling grid system shown.

The diffuser deflecting vane shall be curved providing a horizontal air pattern along the ceiling surface in which it is located. The deflecting vane shall be factory attached, and fixed.  An adjustable vertical down blow section shall be located within the center of the diffuser, and shall be field adjusted to provide a vertically directed air jet across the wall or window adjacent to it.

Combination supply and return air assemblies shall include a fixed, supply air slot for horizontal discharge of air with a vertical discharge section as described above, and an air passageway to the ceiling plenum for return air.

Diffusers shall be constructed from minimum 24 gauge zinc coated steel.  The exposed face surfaces and deflection vanes shall be painted flat black.

Model FDB / FSRB Optional Accessories
Provide field mounted inlet balancing dampers as scheduled. Plenums shall be insulated with (1/2" internal insulation) (1/2" external foil-faced insulation) (1/2" internal foil-faced insulation). Side tees shall be included where shown and shall be finished with Anemostat Arctic White.  Provide surface mounting frames for installation into hard surfaced ceilings as required.  T-bar clips will be provided to stabilize the diffuser within grid systems.