Circular Insert type galvanized steel type, mechanical controllers for insertion into ducting, for the quick and easy balancing of constant volume flow rates in ventilation and air conditioning systems

​Features​

- Simple and quick commissioning on site

- Precise and simple setting of volume flow rates using a scale

- No power required

- Reliable and stable structure, maintenance-free.

- Working pressure range: 50~300 Pa (0.2~1.2inwg)

- Complies with UL181 duct-work construction