Local Storage seems to be disabled in your browser.
For the best experience on our site, be sure to turn on Local Storage in your browser.

We are the Market Leader in Dust Control Spare Part Supply

  • My Account
  • My Wish List
  • Sign In
  • Compare Products
  • Create an Account
    Toggle Nav
    Search
    Quick orderReorder
    EX VAT
    Quick orderReorder
    Home
    My Account
    main product photo

    Non-return (back draught) Damper

    Non return (back draught) shutter damper.

    Available in sizes ranging from 100mm to 400mm diameter.

    • Body is constructed from galvanised steel.

    • Blades are made out of Aluminium.

    • Easy installation in any position.

    • Spring loaded blades to prevent unwanted flow of air.

    Need an ATEX version?

    For more information, read more.

    Read More

    Starting at £6.80 £5.67

    Available
    FREE DELIVERY over £350
    Product Code
    back-draught-damper
    Data Sheet

    RELATED CATEGORIES

    Dampers

    Need Advice before you buy?

    You can call us or email and we can help you find the product you need.

    03456 800 696

    info@dustspares.co.uk

    Reviews.io Logo Stars review

    “Excellent service from start to finish. Well done all involved.”

    Timothy

    Verified Buyer Verified Buyer
    Scroll right for more information
    Product Code Diameter Stock Qty Price
    BDS100 100mm 3 - 5 Working Days
    £6.80 £5.67
    BDS125 125mm 3 - 5 Working Days
    £8.22 £6.85
    BDS150 150mm 3 - 5 Working Days
    £12.62 £10.52
    BDS160 160mm 3 - 5 Working Days
    £12.62 £10.52
    BDS200 200mm 3 - 5 Working Days
    £14.87 £12.39
    BDS250 250mm 3 - 5 Working Days
    £25.38 £21.15
    BDS315 315mm 3 - 5 Working Days
    £37.86 £31.55
    BDS355 355mm 3 - 5 Working Days
    £32.26 £26.88
    BDS400 400mm 3 - 5 Working Days
    £60.11 £50.09
    Related Products

    Why Choose Dust Spares

    With over 23 years in business, we are the market leader in dust control spare parts supply.
    Here are just some of the statistics we are proud of:

    400
    Thousand

    Items Sold

    75
    Thousand

    Orders Shipped

    50
    Thousand

    Items In Stock Today

    FREE
    Delivery

    On All Web Orders Over £350

    NEXT
    Day Delivery

    Available On All Stock Items

    Trusted by these brands

    • Ministry of Defence
    • Warburtons
    • BBC
    • Dyson
    • Rolls Royce
    • NHS

    These simple "butterfly" type backdraught dampers have lightweight hinged blades which will only open in one direction, preventing airflow in the opposite direction. They feature a small spring to keep them in the closed position without causing significant back pressure when the fan is running.

    Backdraught dampers are normally used on ducted extract systems to prevent cold outside air from being blown back into the building when the fan is turned off.

    For airflow control in ventilation systems, the aluminium blades will open when blades are exposed to overpressure and will shut again when pressure falls away, thanks to a stainless steel mechanical spring.

    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.

    More Information
    Diameter 100mm-400mm
    Minimum Price Inc VAT 6.80
    Minimum Price Ex VAT 5.67
    Reviews

    • Delivery Information

      Standard delivery when ordering before 2.30pm with DPD and before 12:30 with DX

      Expresspaks - £8.99 | Standard from £12.48

    • Next Day - Pre 10:30am - DPD

      Next working day before 10:30am when ordering before 2.30pm available on some items

      From £21.19

    • FREE UK DELIVERY

      When you spend over £350 in one order.*T&C Apply*

      FREE

    • Lead Times & Back Orders

      Orders with a lead time can be split at checkout

      FREE
    Click here for more information
    Product Questions

    Product Questions

    See all
    No questions yet. Be the first to ask the question!

    Read the latest from our blog...

    Flexible Ducting VS. Rigid Ducting

    Read more

    How to: Assemble Unistrut Bracket Kit

    Read more

    How To Order Bespoke/Fabricated Ventilation & Ductwork Parts

    Read more

    Testimonials