The Aldes CSB3-WS Constant Supply Box is a wall register box which incorporates an automatic, pressure independent balancing damper that regulates supply airflow in duct systems to constant levels. The passive control element (CAR3) in the CSB3-WS requires no electric or pneumatic power, sensors, and works solely off system pressure. Each CSB3-WS includes mounting brackets, and all necessary hardware for installation.

The CSB3-WS compensates for changes in duct pressure caused by stack effect, operable windows and doors, wind, loading filters, etc. The CSB3-WS provides a low-cost solution to maintaining the correct airflow balance of ventilation systems, improving system performance and indoor air quality, and provides significant savings on annual operating costs.