Abstract: Through construction techniques, geometric design, and materials selection, audio entropy or randomness is introduced within an equipment structure or enclosure. This takes away the available sound energy by absorbing it or making it do work and dissipate before it can project audible sound outside the equipment structure or enclosure. “Damping” of the sound traveling through the equipment structure or enclosure is achieved by applying foam and/or fiberglass board/mat material to surfaces within the equipment structure or enclosure. By employing different material densities in the equipment structure or enclosure, sound levels at different frequencies can be diminished by not allowing them to pass through the structure or by greatly decreasing their amplitude. The semicircular sheathing within the equipment structure or enclosure that forms part of the airflow path refracts sound waves at different angles and does not make a good waveguide for transmitting the sound, which diminishes it.