Carroll (1995) describes the installation of an air handling unit in an Ohio biosciences laboratory:
The heat wheels were incorporated into a large custom air handling unit. The unit was manufactured in 20 separate sections...and reconstructed "erector set" fashion. One hundred percent outdoor air enters the unit through louvers that face west ....Air that passes through the unit is conditioned as follows: roll filters; 30 percent particulate filters; heat wheels; heating coils; cooling coils; 99.9 percent final filters; "ultra sorb" grid stainless steel humidifiers, then into the supply air duct. Steam for the humidifiers is provided by boiling deionized water in special stainless steel humidifiers ... . Exhaust air returns through sealed stainless steel ductwork to the air unit. The exhaust air passes through 30 percent particulate filters, the heat wheels, the exhaust fans and then is discharged through exhaust louvers that face east. The prevailing winds dilute the exhaust air and carry it beyond the recirculation range of the intake louvers.
