Norsound NOR820 Retro Fit Door Bottom Auto Drop Seal

  • Automatic drop-down seal
  • 9 lengths available from 400mm to 1200mm
  • Retro fitted product
  • Simple installation
  • Can be trimmed back up to 125mm from one end


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Norsound NOR820 Retro Fit Door Bottom Drop Seal - Various Widths


This product is designed to be fitted to the bottom edge of acoustic timber or metal doorsets to close the gap to the floor and create and airtight seal.  This is a retro-fit product and is fitted by being screwed to the bottom edge of the door. Installation of the NOR820 drop seal provides smoke and acoustic performance without the removal of timber from the door. Fitting of the seal is not detrimental to the doors performance for fire resistance.

Door manufacturers such as Falcon Strebord, Halspan, Flamebreak etc advise: Surface mounted automatic drop seals may be used where the fitting of these does not require the removal of any core material.

Recommended to be used in conjunction with NOR630 Aluminium Threshold.





Meets smoke requirements BS 8214

Acoustically tested in accordance with BS EN ISO 10140-2

Standard Lengths (mm)

400, 500, 600, 700, 800, 900, 1000, 1100, 1200




Aluminium, PVC

Size (mm)



Satin Silver, Grey gasket

Maximum Gap Coverage (mm)


Cutback (mm)

125, 130 (400 length only)

To quickly find out the shipping cost for your order simply add the required items to your cart. Place your cursor over the cart icon at the top of the page. Click on "Calculate Cart Shipping". Select your country and region and enter your postcode. The shipping rate will be displayed. If your country is not listed please contact us for a shipping quote.

UK Shipping Charges For Most Products

Orders with a value of £0.00 to £54.99 have a £7.00 carriage charge with tracked next working day delivery.

Orders with a value of 55.00 to £99.99 have a £12.00 carriage charge with tracked next working day delivery.

Orders with a value of £100.00 or more qualify for free next day shipping.

Excluded Items

For carts which contain Plasterboard, Soundproofing Mat, SilentBoard, QuietPanel, Silent Floor Ultra, M20 and R10 the following charges apply

£8.00 carriage for the first item and £4.00 carriage for every item added up to a maximum charge of £75.00.

Some soundproofing items have a minimum order due to shipping constraints.

Bulk Products have a £75.00 pallet charge per item.


Our policy lasts 30 days. If 30 days have gone by since your purchase, unfortunately we can’t offer you a refund or exchange. To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging.

Non-returnable items:- Made to order items such as our Office Acoustic Panels and High End Audio Acoustic Panels, Gift cards.

To complete your return, we require a receipt or proof of purchase. Please contact us for your return authorisation number. Once your return is received and inspected, we will send you an email to notify you that we have received your returned item.


We only replace items if they are defective or damaged. If you need to exchange it for the same item, send us an email at and send your item to: Advanced Acoustics LTD, Unit B, Maunside, Green Line Industrial Estate, Mansfield, NG18 5GU, United Kingdom.

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