The round retrofit air terminal unit model PT is designed to regulate air flow of conditioned air in single duct or dual duct air distribution systems. The round retrofit ATU is also used to provide positive or negative pressures in laboratory flow hood applications. The Model PT is primarily used to convert constant volume single or dual duct air terminals to more efficient variable volume air terminals without disrupting the total system operation. The round retrofit ATU is easily installed into existing ductwork in front of the existing air terminal.

• Available in sizes 4” to 16” round.


PT Series shown in a duct system.