Ceiling diffusers shall be directional type Model D as manufactured by Anemostat, and shall have a square or rectangular neck.  Diffusers shall have a fixed, horizontal air discharge pattern, and shall be configured with a 1,2, 3 or 4 way core / discharge pattern as scheduled.   The diffuser core shall be removable, without tools, for cleaning or re-configuring the space air distribution.  No screw holes shall be visible.  For units requiring an adjustable air discharge pattern from horizontal to vertical projection, Model PF pattern flaps shall be factory installed in the diffuser and allow for field adjustment.

Diffusers shall be constructed from steel, aluminum, or 304 stainless steel as scheduled.  Steel components / hardware required for design integrity are acceptable for aluminum construction.

Accessories shall be provided as required and scheduled to meet the design intent.   Model SRA square to round duct adapters shall be used in transitioning to round duct.  Adapters shall be of sufficient height to include opposed blade volume control dampers, and equalizing deflectors as scheduled.  Dampers shall be adjustable from the room side by removing, without tools,  the inner core assembly.   Model TRV throw reducing vanes shall be factory provided and attached to the core, if indicated, to direct air out the corners of the diffuser.

The manufacturer shall provide performance data obtained in accordance with current ANSI/ASHRAE standard 70.

The baked-on finish shall be Anemostat Arctic White, or color as scheduled.  If custom, a sample color chip shall be provided to the diffuser manufacturer.