STR Circular VAV Terminal Units

ASLI Circular Variable Air Volume (STR) Terminal Units are volume flow rate controller for supply air on variable air volume system. These units are designed to control the airflow rate of conditioned air into an occupied space in response to a control signal from thermostat or
Building Automation System (BAS). They could be used in stand alone system or interfaced with LONWORKS.

ASLI STR Terminal Units also incorporate control components, (VAV controller actuator, and transformer) which are factory fitted. ASLI in-house testing facility ensured that all boxes that come out from the factory are calibrated and tested to match the controller of individual size. This allow the terminals to monitor the desired flow rate, as dictated by the thermostat or BAS, and compensate instantly for any changes in supply air pressure that might tend to alter the supply air volume. Hence, the net result is a pressure independent variable air volume system. Two models are available, STR (basic unit) and STRC (basic unit with external cladding to
reduce case radiated noise).

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Casing : 0.7mm galvanized steel.
Damper blade : Double layer 0.7mm thickness galvanized steel with a sandwiched peripheral gasket
Bearing : Engineering plastic.
Hexagon shaft : Hexagon bar mild steel.
Differential pressure sensor : Aluminum.
Cladding (Optional) : 0.7mm galvanized steel packed with fiberglass.

Air Volume Control Type

Variable Air Volume (VAV) Pressure Dependent Control Variable Air Volume (VAV) Pressure Independent Control Constant Air Volume (CAV) Pressure Independent Control
•Without differential pressure sensor
•Pressure dependent
•No monitoring of air volume
•With differential pressure sensor
•Pressure independent
•Air volume varies depending on design flow and signal by controller
•Air volume could be monitored
•With differential pressure sensor
•Pressure independent
•Air volume is constant (design flow) provided that the minimum static pressure is achieved
•Air volume could be monitored


• Oval shape damper for better flow management.
• Neoprene peripheral gasket to prevent leakage.
• Multi-point averaging inlet differential pressure sensor.
• Round inlet and outlet with beading for good connection.
• Hexagon shaft for better grip mounting of actuator.
• Shaft indicator indicating damper position.
• Double layer heavy gauge damper blade.
• Protective metal shroud for control components mounting.
• Can be used for Constant Air volume (CAV) application.
• Optional external cladding to reduce case radiated noise (STRC).


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