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What type of fitting is used to connect a round duct to a rectangular duct in HVAC systems?

A. Round reducer

B. Rectangular elbow

C. Circular transition

D. Square to round transition

A round reducer would be used to connect two round ducts of different sizes.

A rectangular elbow would be used to change the direction of a rectangular duct.

A circular transition is another term for a round reducer and is not the correct option for connecting a round duct to a rectangular duct.

A square to round transition is specifically designed to connect a square duct to a round duct, making it the most suitable option for connecting a round duct to a rectangular duct in HVAC systems.

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