The Carnes Model AR replaces a short section of duct ahead of an existing terminal unit.
The system with constant volume reheat terminal units can be easily converted to variable air volume by adding a retrofit
unit upstream of the existing terminal unit which can now serve as a sound attenuator. The internal damper of the existing
terminal unit should be removed, or placed in the full open position. This allows the existing terminal unit to act as a
sound attenuator. The pneumatic thermostat, which formerly activated the reheat coil, can now be used to control the AR
unit and the existing coil when required. There is no insulation in contact with the air stream. This product is ideal
for Hospitals, Labs, Schools, and Government Buildings, i.e., anywhere where Indoor Air Quality (IAQ) concerns exist.