12 Office Building Roof Top Mechanical Equipment Noise

Noise Expert (acoustical engineers) was asked to evaluate the mechanical noise from a rooftop HVAC system located directly above an open office space in Chandler, Arizona.

The low frequency noise levels were very high in the office spaces below the roof top unit.  The ductwork takes an abrupt 90 degree turn under the roof in duct that is too small for the volume of air being moved.  Hence, the air velocities are very high and cause low frequency rumble.

Read more…