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34 TRG-TRC007-EN
notes
period three
Acoustical Analysis
The work, and art, of an acoustical analysis is in identifying and quantifying the
various paths that sound travels from the source to the receiver. There are
primarily three different types of sound paths.
n Airborne: This is a path where sound travels with, or against, the direction
of airflow. In a HVAC system, sound travels along this type of path through
the supply ductwork, return ductwork, or an open plenum.
n Breakout: This type of path is typically associated with sound breaking out
through the duct walls and into the space.
n Transmission: This is a path where sound travels through walls, floors,
and ceilings. In its simplest form, this path involves sound traveling directly
through the air from the source to the receiver.
Typical Sound Paths
I Airborne
K Sound that travels through supply ductwork, return
ductwork, or an open plenum
K Can travel with or against the direction of airflow
I Breakout
K Sound that breaks out through the walls of the supply
or return ductwork
I Transmission
K Sound that travels through walls, floors, or ceilings
Figure 38