Non Return Dampers
Prevents reverse flow in duct systems.
100mm blade with 160mm frame.
Linkage for synchronised blade operation.
Continuous shafts for high strength.
Suitable for fan discharge outlets.
Available with counter balance for pressure relief applications.
Application
Type ADB-01 back draught shutters are specifically designed to prevent
reverse flow or circulation of air in ducts for both HVAC and process applications.
They are particularly useful in preventing reverse flow through an idling
fan in applications where dual fan, duty and standby systems are used.
Construction
The units have 1.2mm galvanised steel frames housing 0.7mm galvanised steel
blades, these are mounted on continuous shafts running in nylon bearings
sealed through the casing to prevent air leakage through the duct wall..
An internal linkage ensures even opening of each blade., The damper blades
may be fitted with neoprene edge seals to reduce leakage in the closed position.
Range
Available as standard in galvanised steel, with the option of stainless
steel for corrosive or high temperature conditions. Single module size 1200
wide x 1600mm high with no limit to size with multi-module units.
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