For internal use in buildings within HVAC systems where air control and low closed blade leakage performance is required.

• Suitable for environments where maintaining low leakage is critical (e.g. data centres).
• Suitable for velocities up to 20 m/s and duct pressure to 2000 Pa.

The HD series damper range offers blade profiles that provides air volume control through to low closed blade leakage characteristics, that have been designed for systems where high air pressures and velocities are involved.

The aerodynamic blade profile encourages smooth airflow offering minimal pressure drop. Side covers are fitted to the flanged case not only ensuring that the dampers meet Class C case leakage of DW144, but additionally safeguarding against hands and foreign objects

being placed into the path of the moving linkage. Available in a range of different sizes and configurations.

Features and benefits:

• Standard case construction is galvanised mild steel.
• Low leakage blade.
• Four case options.
• Control is either manual, specified Belimo actuators, or extended spindle control, allowing on-site conversion without special tools.
• Enclosed drive mechanism out of airstream.
• Easy transition from manual control to motorised and conversely.
• Can be supplied with blades and case in Grade 430 and 316 stainless steel.
• Air control and system balance.
• Variable flange dimensions and casing depths.
• Stainless steel side seals option to order.
• Flanged case dampers include side covers enclosing the drive linkage ensuring Class C case leakage.
• Vertical blade support that complies with DW144 available.