Lau’s round, low leakage control dampers were developed in response to industry requirements for a low leakage butterfly damper, which easily installs in round spiral duct work. The specially designed blade-to-frame polyethylene foam seal is sandwiched between two round blades and fully encompasses the blade edge. It can be optionally furnished with a variety of manual, pneumatic, or electric actuators (fail-safe spring return or double action).
CRS25 Round, Low Leakage Commercial Control Damper Catalog
Control Damper Installation Instructions
Control Damper Operating & Maintenance Instructions
Minimum Torque Requirements for Commercial Control Dampers