Canadian Consulting Engineer

Control dampers offer ‘light-tight’ sealing

March 27, 2022

Mechanically fastened blade seals ensure Class 1A leakage performance when closed.


CD450V. Photos courtesy Ruskin.

Ruskin, part of Johnson Controls, has developed its CD450 and CD450V extruded aluminum control dampers to create a ‘light-tight’ sealing effect for improved energy efficiency in commercial and institutional buildings, including data centres, hospitals and office buildings.

With a 4-in. wide frame and finger-style jamb seals, the dampers are designed to control and regulate air movement in medium- to high-velocity heating, ventilation and air-conditioning (HVAC) systems. The CD450 (pictured, below) features a horizontal airfoil blade orientation, while the CD450V’s (above) is vertical.

Mechanically fastened blade seals offer low pressure drop—and reduced noise—when open and can ensure Class 1A leakage performance when closed. Acetyl copolymer blade end caps enhance sealing further.

A telescoping shaft provides up to an 8-in. extension for offset actuator mounting, while a coupler option allows two damper sections to be joined and operated by a single actuator on the outside of the frame, providing a space-saving profile in tight areas. The dampers also feature positive lock axles, non-corrosive bearings and shake-proof linkage to minimize service needs.




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