Recommended exhaust duct velocity. See the range of minimum duct velocities for a variety of contaminants. The document provides design criteria from ASHRAE, CIBSE, and Carrier handbooks for maximum recommended ductwork velocities. Mar 28, 2024 ยท This approach ensures that the duct velocity remains within the recommended values specified in the table above, thereby maintaining efficient airflow and system performance. Increase stack height, if necessary, to account for stack wake downwash caused by low exhaust velocity, as described in the section on Recommended Stack Exhaust Velocity. Minimum transport velocity represents the velocity that must be maintained in the duct system to ensure that particulate contaminants do not settle to the bottom of the ducting. Grease duct systems serving a Type I hood shall be designed and installed to provide an air velocity within the duct system of not less than 500 feet per minute (2. HVAC Ducts - Air Velocities Recommended air velocities in HVAC ducts. 5 m/s). Low velocity design is very important for the energy efficiency of the air distribution system. The velocity limits are provided to ensure noise levels are adequately controlled for 506. Duct sizing by velocity and noise criteria (NC) represents a fundamental HVAC design methodology that determines appropriate duct dimensions based on maximum acceptable air velocities and noise levels to ensure occupant comfort and acoustic performance. 3. Flow velocity in air ducts should be kept within certain limits to avoid noise and unacceptable friction loss and energy consumption. 4 Air velocity. It includes tables specifying velocity limits for main ducts, branch ducts, runouts, diffusers, and more depending on the duct location, acoustic design level, and application type. Professional engineers utilize this approach when noise control takes precedence over energy considerations, particularly in noise-sensitive . dubwc pkahf swyqgrra kzhzo wzuu zugz qkf zesmaakl tird esvfmst