Provide Anemostat Model AD supply air distribution plenums of the length and inlet size as shown.  Plenums shall be specifically designed to match Anemostat Model SLAD, SLAR, and SLAC linear diffusers and returns.  Plenum cross sectional areas shall be sufficiently sized for the length and design air flow to achieve no more than a 75° angle of discharge. Plenums shall be constructed from coated steel.  Side inlet collars shall be at least 1" long. 

(Optional) Provide field mounted inlet balancing dampers as scheduled. (Optional) Plenums shall be insulated with (1/2" internal insulation) (1/2" internal foil-faced insulation) (1/2" external foil-faced insulation) (3/8" internal fiber-free foam insulation).