79363182
Jan 24, 2023
Internal coatings of vents and ventilation ducts, both masonry and prefabricated, made from plastic, plastic resins or plastic-based composite materials which, after being drawn into place in a soft form, are inflated and hardened by steam, forming to the path of the duct or the shape of the internal liner of the canals or ducting, being parts of non-metal ducts
Nonmetallic Building MaterialsInstallation, repair and renovation of vents and ventilation ducts, both masonry and prefabricated, in which the duct liners are made from plastic-based composite materials that, after being drawn into place in a soft form, are inflated and hardened by steam, or the path of the system has been built using such liners
Building Construction and Repair