... conditioner duct) material: gavalnised steel, Stainless Steel. Heat-preserve Internal Joint (HVAC duct ,air conditioner duct) purpose: HVAC, inlet and outlet ... in vemtilation system.Material: Galvanized Steel , Stainless Steel (With rubber /gasket & No rubber/gasket) Size: Dia.80, 100, 125, 150, 160, 180 ...