"Supply of Ceiling Suspension Galvanized / Aluminum / SS 304/CRCA Sheet Powder Coated Construction. Laminar Air Flow Housing with Low leakages G.I. Gear operated Volume Control Damper, Side Connection, DOP Testing arrangement, Pressure Plate to fixing of filter, Internal arrangement for fixing of HEPA Filter with Mini Plate HEPA Filter, Aluminum & SS 304 Capsule Perforated Supply Air Grill."