BSB Dampers
Air, Fire and Smoke Control
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BSB Engineering Services Ltd.
Unit 56, Trinity Trade Centre,
Mill Way, Sittingbourne,
Kent ME10 2PD, United Kingdom
Sales Office: +44(0)1795 422609
General Enquiries:
+44(0)1795 505366
For purchase orders please email:

For pricing enquiries please email:

For technical enquiries please email:

For all other enquiries please email:

The BSB BD Series Backdraught Damper


The nominal 60mm wide standard extruded aluminium blades are fitted onto 6.25mm diameter spindles, complete with blade edge brush seal fitted as standard.

Please scroll down page to view blade dimensions and position details

All blades are fitted for parallel operation only.

Blades are linked with a precise linkage, minimum two blades and a maximum of 6 blades per linkage set, alleviating movement and subsequent rattling of individual blades. Please refer to pressure drop figures for suitability.

Avoid use of dampers in extremely turbulent duct conditions. Although blade linkages will stabilise blades in most conditions, abnormal circumstances may cause dampers to malfunction.

Horizontal Applications
Where dampers are required to be installed in horizontal applications, a galvanised steel blade limiting stop will be fitted running full length to one side only to prevent locking in the open position. When making an enquiry or placing orders, it is important to inform horizontal or vertical damper position.

Shown above is illustration of standard extruded aluminium blade.

For details of the number of blades for individual damper sizes Click Here

Blade Position and Dimensions

BSB Engineering Services Ltd. reserves the right to modify or withdraw any specification without prior notice that may result from continuous product development. The information contained within this website is for reference only. Full product details should be obtained from our Sales Office.

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