A sound attenuating apparatus for mounting on a heat exchanging apparatus
such as a cooling tower, this apparatus having an attenuator housing with
vertically extending sides, a top cover and a bottom adapted for mounting
on the tower. There is an annular air inlet in the bottom and an air
outlet is formed in at least one of the sidewalls. Perforated interior
walls are mounted in the housing and define an /airflow passageway that
extends from the air inlet to the air outlet. These walls include a first
annular wall section extending about and defining an outer circumferential
portion of the airflow passageway and a second wall section with that is
annular and extends about a substantially vertical central axis. The
latter wall section defines an inner circumferential portion of the
passageway. The second wall section extends generally upwardly and
outwardly from the air inlet. Sound absorbing material is arranged behind
the perforated walls.
