BDS - Back-draught / Non-return

Product Code: BDS

Designed to permit air to flow in only one direction, preventing heat loss or backflow through intermittently used ducts - Also known as non-return dampers.

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Width x height / Diameter

Duct connection

Linked/weighted blades

Temperature spec

Finish (standard unless stated)

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Description

About BDS - Back-draught / Non-return

Specialist damper, designed to permit air to flow in one direction.

Back draught shutters, also known as non-return dampers are designed to permit air to flow in only one direction, making them useful for applications where a duct is only used at intervals, and needs to be shut down when not in use to prevent heat loss or backflow.

Series BDS units have all major components manufactured from aluminium extrusions, ensuring an inherent high resistance to corrosion and minimal weight.

As standard back draught shutters are supplied with unlinked blades, however for applications with duct velocities exceeding 5 m/s we recommend the specification of linked blades; this adds a concealed linkage which connects each blade, and has the effect of smoothing the motion as the blades open and close. This linkage can also be equipped with removable weights, allowing dampers to be set up on site to open and close at specific pressures.

Back draught shutters are manufactured in-house to your requirements, with our industry beating lead times.

Please download the product PDF for detailed information and ordering codes.
Specification
BDS - Back-draught / Non-return Specifications
Design, construction and finish:

Material: Extruded aluminium frame and blades, steel and plastic parts
Standard duct connection: Square flanged
Optional duct connections: Square, circular or flat oval spigot
Standard finish: Mill finish aluminium
Optional finishes: Polyester powder coated to any RAL or BS colour
Properties:

Free area: 86% maximum
Mass/m2: 14 kg
Recommended use:

Internal/External use: Internal
Recommended use: Airflow direction control
Information above is for quick reference purposes only, please see the full product datasheet for detailed information
Downloads
Downloads for BDS - Back-draught / Non-return
- Series BDS - Product datasheet
- O&M manual - Volume control dampers

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BDS - Back-draught / Non-return