The PTS unit can operate as a shut-off, control or adjustment damper depending on the product model. This damper is available for circular standard duct sizes 100 mm to 500 mm. Damper position is visually indicated below the operating mechanism.

The PTS/A is a shut-off damper of leakage class 4 according to the EN 1751 standard. It includes rubber gaskets to ensure low leakage flow when the damper is in closed position. The PTS/A is available with a handle for manual operation or with an electric actuator for on-off control or for modulating control using a 0...10 VDC control signal.

The PTS/B can be used for airflow control or adjustment of airflow rates in the ductwork. It includes a steel blade without gasket. Like the PTS/A, the PTS/B can be used manually or with a electric actuator.

The PTS/C is an airflow adjustment damper. The damper blade is a perforated blade that is acoustically and operationally designed for balancing of airflow rates.

Ravenscroft supplies Halton MSD airflow measurement units, which are based on differential pressure created by measurement probe pipes. The corresponding airflow rate can be defined by measuring the pressure difference sensed by the two crossing sets of averaging probes. MSD units prove very accurate measurement, inaccuracy less that ±10 %.