Commercial grade plenum fans have a centrifugal fan wheel that is not encased in housing. With a plenum fan, air can discharge in many directions due to the wheel fan pressurizing system. This can be a great option to circulate air quicker. Plenum direct drive fans have fewer moving parts than a belt driven fan, and there is less vibrations which in return produces a quieter application. Belt drive blowers however, assists in dust control for essential air quality. We have additional commercial exhaust fans, OEM specialty blowers, and plug fans for HVAC systems.