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Overview. Airflow balancing, adjustment and measurement functions. Manual adjustment, no tools required. Accurate airflow measurement based on flow nozzle principle. Minimised sound generation due to conical adjustment section. Temperature operation range from -30 °C to +70 °C.
Oct 6, 2021 · The Halton PRA airflow management damper is quiet, accurate, easy to install due to compact size, and easy to adjust. It is a best seller in its category and a legendary product of Halton...
PRA is a cone-shaped iris damper and has manual adjustment with knob. The adjustment damper contains an adjustable cone and measuring socket for measuring the pressure difference in the air flow. The measuring damper housing and the cone-shaped iris blades are made of galvanized steel.
Function. The airflow rate is adjusted by turning the adjustment knob in order to change the aperture size of the adjustment cone formed by iris blades. Once the opening area is reduced, the airflow rate decreases and the total pressure loss caused by the device increases.
This document provides information on Halton air flow dampers, including the PRA adjustment and measurement unit. The PRA unit allows for manual adjustment of air flow without tools, and accurate air flow measurement based on a flow nozzle principle.
The airflow rate is determined by measuring the differential pressure in measurement tabs using a manometer. The flow rate is calculated using the formula below. K-factor is retrieved in both the tables presented below and in installation guidelines. K-factor depends on the unit size and adjustment position (a).
PRA is a cone-shaped iris damper and has manual adjustment with knob. The adjustment damper contains an adjustable cone and measuring socket for measuring...
