What is the maximum trunk velocity recommended for a rigid residential duct system?

The maximum trunk velocity recommended for a rigid residential duct system typically falls within the range of 700 to 1,200 feet per minute (FPM). This range is considered optimal because it balances efficiency and comfort while minimizing noise and pressure loss in the ductwork. When duct velocities exceed this range, the risk of creating excessive noise levels increases, which can make the indoor environment less comfortable. Additionally, higher velocities can lead to increased friction losses in the duct system, causing a drop in air pressure that can affect system performance and efficiency.

The specified range is also designed to ensure adequate air distribution throughout the residential space, preventing issues like uneven heating or cooling. Maintaining trunk velocities within this recommended limit helps provide a healthy and comfortable living environment.