What is the maximum interval, in inches, for attaching metal straps that support ducts?

The maximum interval for attaching metal straps that support ducts is based on codes that ensure safe and proper installation. Specifically, the provision of a maximum attachment interval helps to maintain the structural integrity of the ductwork, preventing sagging or shifting that could lead to inefficiency in the HVAC system or even damage.

The maximum interval of 64 inches is designed to provide adequate support without allowing the ducts to become misaligned or unsupported over long spans. This distance is substantial enough to conveniently meet installation requirements while ensuring that the necessary strength and stability are maintained throughout the duct system. Adhering to this interval also aids in facilitating maintenance and inspections of the ductwork.

It is important to note that greater attachment intervals could compromise the proper functioning of the ducting system, leading to potential air leaks or performance issues, while smaller intervals could unnecessarily increase labor and material costs.