The perforated supply diffuser with face mounted pattern controllers (PDF) is extremely versatile, available in a wide variety of sizes with a full selection of frame and mounting styles. 

The face mounted pattern controllers provide an adjustable horizontal air pattern with a strong Coanda effect against the ceiling. Louvered air pattern deflectors are spring clip mounted on the back of the diffuser face. Simply pull down and rotate pattern deflectors for easy field adjustment of the discharge pattern (4, 3, 2 or 1-way).