The fabrication process for HVAC ducts involves precisely cutting and bending sheet metal into the desired cylindrical or rectangular shapes. A professional is needed to make sure all of the manufactured pieces fit together tightly. 

The installation of HVAC ducts requires a skilled technician to ensure proper placement and sealing to maximize efficiency and minimize air leakage. Regular maintenance and cleaning of the ductwork is also necessary to prevent the buildup of dust and debris that can negatively impact indoor air quality.

This process requires specialized tools and equipment, as well as knowledge of industry standards and regulations, to ensure proper installation and functionality of the HVAC system. It is important to hire a reputable contractor with experience in HVAC duct fabrication for optimal results.