However, because the increase in system air resistance attributed to these other items takes place, by and large, regardless of fan/blower type and selection, it will not be considered further.

Other components, such as coil banks, filter arrays or dampers could be added upstream or downstream of this combination.

For purposes of this discussion, a conventional fan tower shall be defined as a system with the following connected components:ġ) Inlet silencer bank (one or more rectangular sound traps) Ģ) Nozzle transition (to help concentrate airflow from the inlet bank towards the fan's inlet port) ģ) Inline fan (axial, propeller, mixed-flow, or tubular centrifugal) Ĥ) Evase transition (to help diffuse airflow from the fan's discharge port to the downstream silencer bank) andĥ) Discharge silencer bank (one or more rectangular sound traps). What's more, the PDA probably uses less energy and is much quieter in operation.Īnalogous development has occurred in fan tower design. For example, today's hand-held personal digital assistant (PDA) holds more memory, functions and features than a desktop personal computer introduced ten years ago. Miniaturization is a consequence of technological advancement.

Sound trap sound control systems