Heavy Duty Damper › › ›
FLOWTECH Heavy Duty Damper (HDD) is constructed by high galvanized steel or stainless steel moving parts. The bush is made of phosphor bronze material while the damper frames constructed of 2mm or thicker galvanized steel or SUS, 150mm X 50mm or more cold-formed channels with full-welded corners or metallic plug joints. The single 1.5mm or thicker double-skinned airfoil blades (total 3mm or more) with special edge seals ensure low air leakage through the closed damper and handle hot gases. To minimize air leakage, stainless steel jamb seals are incorporated on the vertical frames of the dampers. The blade axles are made of 15mm diameter steel shafts and pivot or phosphor bronze bushes. Sleeves may be used if the dampers are installed within the wall or connected to the adjoining ductwork. The sleeve and retaining angles may be supplied in galvanized steel. The dampers may be powered externally by electric or pneumatic actuators. Upon customer’s requests, Flowtech HDD can be ordered in full stainless steel construction. The HDD is qualified to 4,000 fpm (20.2 m/s) and 12 in. w.g. (3 kPa) and may be installed in, or adjacent to vertical walls or partitions, or horizontally in, or adjacent to floors or assemblies.- Used constructed high quality galvanized steel with stainless steel moving parts.Enable the dampers to withstand adverse environmental condition, as well as prevent seizures.
- Effectively seal by leakage, essential feature of smoke control, and prevent the safety.
- Design by airfoil blades present very low resistance to airflow.
- Certify by UL-555S and AMCA Certificate.
- High resistance pressure, content more than 6,000 Pascal.
- Heat resistance up to 300° in 60 minute.
- Ensure the proper functioning with pneumatic or electric system.
