In Line Fan ventilation Shutter Ducting Back Draught Shutters are designed to provide anti back draught in a duct when our fan has been switched off. A spring loaded butterfly action shutter acts as a barrier when there is no airflow.

 

• Designed to provide anti back draught in a duct when our fan has been switched off

• A spring loaded butterfly action shutter acts as a barrier when there is no airflow.

• Can be fitted in any position in circular ducts

• Also known as non return valves