Supply and installation of all ducting works in galvanized steel sheet (unless otherwise indicated or specified) and shall comply with SMACNA Law Pressure Duct. Ductworks shall include but not limited to elbows, tees, reducers, casing, construction, access doors, hangers, anchors supports, duct joints, flexible ducts, volume dampers, fire dampers, fire doors, damper actuator, motorize relief dampers,duct connections, air deflectors, duct sleeves, penetration of casing, casing curb details, hood construction and other accessories including drive slip, inside groove seam, Pittsburgh seam, sliding seam, standing seam, expansion shield, mechanical joint clip, non-flammable adhesive mastic,continuous corner bead, angle bars and other necessary accessories, etc.