For internal use in buildings within HVAC systems where high air pressures and velocities are involved. Suitable for applications requiring low closed blade leakage characteristics.

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 galvanized mild steel.
• Four case configurations.
• Two blade profiles.
• Three control options.
• Enclosed drive mechanism out of airstream.
• Easy transition from manual control to motorized 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.

Also available to specify separately are the HD-IB interlocking blade, and HD-LL low-leakage blade products.