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

Models and Base Dimensions

Click on illustrations to view larger images

BD Flange Details

Flange Details


W = 100mm to 600mm  
H = 100mm to 1000mm

A = 25, 30 or 35mm 
Please specify

Flange sizes are available under 25mm but will be without mez punch shown.
These will be pre-punched with a 10mm fixing hole.

BD Flangefit Dimensions


W = 100mm to 600mm   H = 100mm to 1000mm
A = 25, 30 or 35mm  Please specify

BD Framefit Dimensions


W = 100mm to 600mm   H = 100mm to 1000mm
B = 40mm (100-354mm); 55mm (355-600mm)

BD Spigotfit Dimensions

Circular Spigotfit

Dia. = 100mm to 600mm
B = 40mm (100-354mm); 55mm (355-600mm)

BD Circular Spigotfit 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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