Constant Volume Regulators (CVRs) limit airflow to a maximum value across its effective range. They are used for both supply and return applications when the designer wants a consistent volume of air to be added or removed from the space. Toilet and kitchen exhaust, Outside Air, and Makeup air are all common applications.
CVRF8 has been designed primarily as a Ceiling mount enclosure for CVRs. They can be fitted with Ceiling Radiation Dampers as well.