GI Duct

Ducts are conduits or passages used in  HVAC to deliver and remove air. The needed airflows include, for example, supply air, return air, and exhaust air. Ducts commonly also deliver ventilation as part of the supply air. As such, air ducts are one method of ensuring acceptable indoor quality as well as thermal comfort. SMACNA, DW 144. Ducts made of GI sheet from .60 mm up to 1.60 mm according to the pressure class, fitted with cross joints such as drive cleats, slip on flanges & GI angles