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Volume, Fire & Smoke Dampers
Volume Control Dampers
The DD Series Duct Balancing Damper was designed for duct installations to balance/regulate airflow.All spindles revolve in low maintenance nylon bushes which are fitted within pressed inserts. Precise blade positioning is achieved via a robust dual-purpose quadrant and spindle assembly, operating the linkage mechanism which is located outside of the airstream.
The quadrant assembly is designed to facilitate simple conversion to motorisation without the need for additional components.
Features
• Standard case construction is galvanised mild steel
• Two airfoil blade designs
• Four casing options
• Out of airflow linkage
• Easy conversion from manual to motorised or vice versa
• Infinite sizing capability from 100 to 1000mm, 100 to 800mm dia.
• Variable flange dimensions
• Comprehensive control options
• Can be supplied with blades and case in 316/430 stainless steel
• Stainless steel side seals to order
Specifications & Tests
• Unless stated otherwise, flange models are suitable for classes A & B of DW144 with spigot models suitable for classes A B & C of DW144
• Conforms to HVCA specification DW144
• Conforms to Eurovent 2/2 classes A - C
• Independent performance tests for pressure drop, leakage and airtightness. Test reports 143, 145 and 146 refer
Blade Detail
Plain Aluminium Blade with End Cap (left) or Galvanised Mild Steel or Stainless Steel Blade (right)
The 63mm wide extruded aluminium airfoil section blades are fitted to 12.5mm diameter spindles, with the option of galvanised mild steel or Grades 316 and 430 stainless steel blades available to order.
All models are available with either opposed or parallel blades (unless specified, opposed blades will be supplied as standard).
Fitted to the ends of the aluminium blades are End Caps to alleviate noise generation.
