What is the recommended design air velocity range to minimize noise problems in residential duct systems?

The recommended design air velocity range to minimize noise problems in residential duct systems is 700 to 900 feet per minute (fpm). This range is optimal for balancing adequate airflow with reduced noise levels, which can be particularly important in a residential setting where comfort and acoustics are essential.

When air moves through ducts at velocities lower than this range, it may not provide sufficient airflow for heating or cooling loads, potentially resulting in uneven temperatures throughout the conditioned space. Conversely, operating at velocities higher than this range can lead to excessive fan noise, whistling sounds at duct turns or registers, and might contribute to increased wear on system components due to higher resistance.

Selecting the correct air velocity is critical for maintaining the efficiency of the HVAC system while ensuring that it operates quietly, thereby enhancing overall occupant comfort. In summary, aiming for the 700 to 900 fpm range effectively achieves the necessary airflow requirements while controlling noise levels within residential environments.