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Commission your ventilation system quickly using air restrictor rings in the distribution boxes instead of the supply and extract valves!

Ubbink’s Air Excellent air distribution system uses air restrictor rings in its distribution boxes to set the air flow rate in each duct run. Designers and installers can use Ubbink’s online commissioning tool to calculate how many rings to cut out for each duct run. The air restrictor rings are very easy and quick to install, which will save a lot of valuable time on-site compared to traditional methods of commissioning ventilation systems.


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