Round metal duct work is fastened with?

Round metal ductwork is typically fastened using self-tapping screws due to their efficiency and effectiveness in creating a secure connection. Self-tapping screws have the ability to create their own hole as they are driven into the metal, which provides a strong hold without the need for pre-drilling. This is particularly advantageous in HVAC installations where speed and accessibility count, allowing technicians to quickly and easily fasten ducts together and to other components of the system.

Moreover, the use of self-tapping screws enables a tight and leak-proof seal, which is critical in HVAC systems to maintain efficiency and performance. They hold the components of ductwork firmly in place, reducing the likelihood of vibration or movement that could lead to air leaks.

In constructing round ductwork, the choice of fastening method must also consider the shape and materials involved. While other methods such as rivets or welds could potentially be used in some cases, self-tapping screws are generally preferred for their ease of installation and the effectiveness of the connection they provide.