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Fire / Smoke Dampers & VCD's

Volume Control 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.

• 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

Specifications & Tests
• Unless stated otherwise, flange models suitable for class A & B of DW144, spigot models suitable for class A B & C
• 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 Details
Plain Aluminium Blade with End Cap                       


Galvanised Mild Steel or Stainless Steel Blade


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.


100 to 1000mm sq.

100 to 1000mm sq.

Circular Spigotfit
100 to 800mm dia.

Flat Oval Spigotfit
100 to 1000mm spigots

Control Options
Extended spindle
Hand Control
Electric Motor
Pneumatic Motor