HVAC Journeyman Practice Exam

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At what intervals must metal ducts be securely fastened in place?

3 foot intervals
6 foot intervals
10 foot intervals
At each change of direction

The correct answer is: 6 foot intervals

The requirement for fastening metal ducts is generally governed by building codes and best practices within the HVAC industry. Fastening the ducts at specific intervals ensures that they maintain their structural integrity and functionality, preventing sagging and potential damage that could lead to air leaks or inefficiency. The correct answer reflects the standard practice of securing metal ducts at 6-foot intervals. This interval strikes a balance between ensuring the ductwork system is stable while allowing for practical installation. Securing at this interval helps to maintain adequate support without overcomplicating the installation process or using excessive materials. Additionally, fastening ducts at each change of direction is important for ensuring that the transitions are stable and do not create points of stress that could lead to failure. While intervals of 3 feet or 10 feet may also be permissible in different contexts, the 6-foot guideline is widely recognized as a standard for metal duct installation in residential and commercial applications.