A manufacturing plant contacted eNoise Control, Inc. to
review noise exposure from several of its variable frequency belt-driven
We conducted sound level readings around the Chicago Blowers and noted
low and mid-frequency levels between 90-91 dB(A), 5 feet from the fans.
Our client expressed a need to access the machines for routine
maintenance. They also did not desire a fully closed sound enclosure because of
ventilation and lighting concerns.
casing shown with Unger's removable
(click image for
Fan shown with
sliding access sound curtain (click image for larger view)
Modular sound curtains used on
double sliding track (click image for larger view)
We determined noise sources associated with this
fan were generated by the variable speed driven motors and the fan casings. The
variable speed drives where re-tuned by the equipment supplier with
little reduction in noise. After this option was tried, Unger
suggested a removable sound blanket wrap be installed on the fan
housing and then a perimeter
sound curtain system be installed
to completely enclose the motors.
We supplied our rugged industrial sound curtains with
a ceiling suspended steel track. Our Acoustical Consultants engineered modular, sliding sound
curtain panels on a double track to allow the customer multiple
access points into the enclosure.
The sound reduction was measured at 12 decibels, thus achieving the
customers acoustic goals well below 85 dBA.
eNoise Control, Inc., 297 North 9th Street, Noblesville, IN 46060
Phone: 1.888.213.4711, Fax: 317.774.1911, info@eNoiseControl.com