The shafts mesh so tightly that backflow is prevented. Typically, bi-lobal fans and tri-lobal are used to recirculate gases in process equipment when environmental consistency is required. Centrifugal ...

Design configuration is an important parameter to consider when specifying HVAC fans and blowers. There are three main choices: axial, bi-lobal or tri-lobal, and centrifugal. Axial fans include ...

and fans and fan performance. Part II covers testing and balancing fume hood systems and cleanrooms, commissioning HVAC systems, centrifugal pumps and pump performance, analog and digital controls and ...