Laminar Air Flow is required in the Operation Theater to remove the bacteria away from the OT Table during the surgery and to maintain the sterility and cleanliness required for the clean Room environment . Air Plenum unit is secured to the main structural frame of the Modular Operation Theatre or Structural slab. The Air/light diffusers consist of two layer of monofilament Precision woven polyster of uniform porosity, with an open area of sufficient resistance to create Laminar airflow from diffuser face.