Monitoring several field observations and through visual observation
of different leaks that were also found in our own laboratory
to perform the above mentioned study (i.e. Air Duct leakage Laboratory
(ADLL) at UNLV) it was found that there can be different
shapes to the leak structure depending on the installation labor
and the complexity of the layout of the duct system in a particular
residence. These leak shapes were sometimes oblong, sometimes
extended closely resembling a rectangular section or more rounded
somewhat similar to a circular hole section. Hence this study was
inspired because of these different shapes to see how the pressure
drop/flow characteristics through simulated but realistic leak
shapes can be obtained.