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Surface Mount Automatic Acoustic Rated Door Bottom Drop Seal 37db - 330mm - 1230mm

Surface Mount Automatic Acoustic Rated Door Bottom Drop Seal 37db - 1230mm

Surface Mount Automatic Acoustic Rated Door Bottom Drop Seal 37db - 1230mm

£26.82 £22.35 (ex. VAT)
Door Bottom Drop Seal Acoustic & Smoke Tested | Surface Mounted Type | Sound reduction Rw 37dB* | Available in the following size 1230mm.

FREE DELIVERY on orders over £600 (£500 ex. VAT)*
*excluding Boards, Batts, Mortar products and the following postcodes IM, HS, ZE, JE, GY, KW, FK, PH33 or AB


Key Points:

  • Surface Mounted door bottom seal - drop down type.
  • Aluminium body with rubber coextruded seal and carrier.
  • Sound reduction of up to Rw 37dB*.
  • Suitable for new and retrofit applications.
  • Screw fixing (screws supplied).
  • Silver Anodised finish.
  • Smoke tested in accordance with BS EN 1634-3: 2004.
  • Certifire Approval.
  • This seal is also available in a rebated version.


The Astro ASDB/SM SEAL is a automatic door bottom seal which is spring loaded to lift clear of the floor as soon as the door leaf is opened by a few millimetres.

An acoustically designed seal for surface mounted applications. It is operated automatically by pressure against the door jamb on its plunger and seals when the door closes and retracts automatically when the door is opened.

Can be fitted on the internal side of the door using the frame to activate the plunger or externally using the bumper provided.

Click here for the rebated door bottom seal version (for timber only doors).

14mm maximum drop, Seal drops on plunger side first.

Suitable for all types of swing doors.

Smoke Testing was conducted to BS EN 1634-3: 2004 smoke control tests for door and shutter assemblies, openable windows and elements of building hardware Part 3: Smoke control test for door and shutter assemblies.


  • Noise Reduction Index: Rw up to Rw 37dB*
  • Maximum Drop: 14mm.
  • Seal Lengths: 1230mm
  • Maximum trimming: 150mm which will take your seal length to 1080mm.


We have technical representatives who provide assistance in the selection and specification of the products on this site and should be consulted for exact installation and product suitability. Ensure an early engagement with ourselves, designers, main contractor and specialist installers before any installation. Other trades and/or manufacturers may need to be consulted. For in-depth information, specification and technical advice please call our Head Office on Tel: +(0)1329 841416 or email


All interested parties, designer, specifier, main contractor and specialist installers should provide access to allow the fire stopping seals to be regularly inspected and maintained, as well as records kept of such maintenance at minimum periods of 12 months, as required by the Regulatory Reform Order, and repaired if necessary. Reference should be made to ASFP TGD 17 Code of Practice for the Installation and Inspection of Fire Stopping.


It is vital that those entrusted to design or install a fire stopping product have the necessary levels of competence to undertake the task professionally and thoroughly. The level of competency required will be commensurate with the expected complexity of the building. All designers must eliminate, reduce or control foreseeable risks that may arise during installation, construction or maintenance when preparing or modifying designs. Clients should ensure that the principal designer and principal contractor carry out their duties under CDM regulations. The ASFP foundation course in passive fire protection provides essential knowledge as part of demonstrating competency and understanding in this key fire protection specialism.

Additional Notes:

* The acoustic ratings quoted will vary depending this product, contact us for confirmation before specifying.

For further information on installation requirements please refer to the door manufacturer data to ensure the compatibility of this product, if in doubt please contact the technical team on: Tel: +(0)1329 841416 or email

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  • Product Code:
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