1) According to the characteristics of the project, the type of air organization required. Adjust the performance and air supply method, etc., and select the corresponding air outlet type.

2) According to the required air volume [supply air or exhaust (return) air], determine the size of the required air outlet within the allowable wind speed range of the air outlet neck (or the inlet and outlet section of the air outlet). If the size of the tuyere is determined according to the wind speed of the tuyere (generally 2~5m/s), the effective area rate of the tuyere (generally 30%~60%) should be considered.

3) Check the main technical performance of the selected tuyere. Such as range, pressure loss, noise indicators, and wind speed and temperature difference in the work area.

4) Determine the layout and installation method of the selected tuyere and the connection method with the air duct.