The design of the HRSI damper provides smooth and axial throttling resulting in a balanced flow pattern with low noise level. The damper is well suited for integration as it is compact. HRSI has air tightness class C.

HRSI is a damper intended for air flow regulation in circular ventilation ducts. The structure of the damper permits simple and reliable flow measurement. HRSI is suitable for installation where low sound values and cleanable ducts are required.