CVRF1: Constant Volume Regulator in a Square to Round Duct Insert

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The CVRF1 is a square to round duct insert.  It allows a Constant Volume Regulator to be installed into the end of rectangular duct work.  It is a heavy-Duty, 24 gauge, 1″ deep box sized to fit inside standard duct work.

We have removed the mounting flanges.  this is perfect for retrofit work where you want to add volume control to existing ducts.

THE CVRF1 is part of the larger family of Constant Volume Devices including register boxes, ceiling mount boxes, fire damper assemblies and more.

Tell us whether the application is for supplies or returns and how much airflow you want to allow.  We can do the rest.


Additional information

Pressure Range

0.2 to 0.8 InWC


Desired Set point ± 10%
Below 50CFM ± 15%

Sheet Metal Fitting

24 Gauge Galvanized Steel


Molded UL94 VO ABS Plastic

Saftey Ratings

UL2043 Flame and Smoke
European Fire and Smoke M1


Friction fit – Rubber Gasket


None Required