When the active chilled beams are sized at the typical inlet static pressures of 0.5" w.c. or less, very low noise levels are achieved as the new technology nozzles are whisper quiet and there is no terminal unit fan or motor in or near the occupied spaces. DADANCO's patented nozzles rapidly induce secondary air to reduce the momentum and height the primary air jet which significantly reduces the noise generated.

Conventional Nozzle		Dadanco Nozzle
			Note the length of the Dadanco jet stream's potential core zone (red area) is shorter
The low noise levels possible with active chilled beams can be most helpful in areas where the ANSI/ASA S12.60-2002 Classroom Acoustics Standard has been adopted. The standard requires a maximum background noise of 35 dB and reverberation time of 0.6 – 0.7 seconds for unoccupied classrooms.