Astroflame Passive Fire Protection Products

Trade Names: Astro ASDB/SM Seal

Acoustic & Smoke Rated Door Bottom Seal


Surface Mounted door bottom seal - drop down type.

Suitable for wooden or metal door assemblies.

Acoustically and smoke tested on proprietary fire doors

Aluminium body with self extinguishing PVC rubber coextruded seal and carrier.

Sound reduction of up to Rw 33dB*

Suitable for new and retrofit

Screw fixing (screws suppied)

Anodised satin clear finish

Tested to 200,000 cycles.

Astro ASDB/SM Seal visual at Astroflame

View a range of styles

>> See more : Additional product images

>> Call us to order: 01329 844 500

>> Email us to order:


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 face mounted applications. It is operated automatically by pressure against the door jamb on its adjustment block and seals when the door closes and retracts automatically when the door is opened.

Can be fitted inside (lock side using bumper provided) or outside of the door (non lock side)

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


Approved Document EApproved Document MSymbol Guide

Tested for durability 200,000 cycles completed without failure for fire rated smoke doors.Surface mount door bottom seal

14mm maximum drop, Seal drops on hinge side before lock side.

Suitable for all types of swing doors.

Noise Reduction Index: Rw up to Rw 33dB*

Min/Max Gap: 3mm - 14mm.

Product Availability

Maximum trimming length 150mm.

Product Code





Astro ASDB/SM Seal

Anodised Satin clear



Astro ASDB/SM Seal

Anodised Satin clear



Astro ASDB/SM Seal

Anodised Satin clear



Astro ASDB/SM Seal

Anodised Satin clear



Astro ASDB/SM Seal

Anodised Satin clear



Astro ASDB/SM Seal

Anodised Satin clear



Astro ASDB/SM Seal

Anodised Satin clear



Astro ASDB/SM Seal

Anodised Satin clear



Astro ASDB/SM Seal

Anodised Satin clear



Astro ASDB/SM Seal

Anodised Satin clear


To Order & Specify

Please contact us and quote the following - Quantity / Product Description / Product Code / Colour / Size
Typical wording - 10 / Astro ASDB/SM Seal / AFASDBSM/330 / Anodised Satin clear / 330mm

>> Tel: 01329 844 500 or >> Email:

Test and Assessment Reports

* The acoustic ratings quoted will vary depending on the door density and any additional threshold & perimeter seals used in conjunction with this product, contact us for confirmation before specifying.

Seals have been tested without threshold plates and also straight down to carpet.

For additional testing, or technical information please contact Astroflame.


For further information on installation requirements please see the installation video or contact the technical team on: tel 01329 844 500 or email

Health and Safety

The product does not present any known health hazards during or after installation. Normal good industrial and personal hygiene practices should be observed. For further information on health and safety requirements please contact the technical team on: tel 01329 844 500 or email


As part of our policy of ongoing improvements, we reserve the right to modify, alter or change product specifications without giving notice. Product illustrations are representations only. All information contained in this document is provided for guidance only, and as ASTROFLAME FIRESEALS LTD has no control over the installation methods of the products, or of the prevailing site conditions, no warranties expressed or implied are intended to be given as to the actual performance of the products mentioned or referred to, and no liability whatsoever will be accepted for any loss, damage or injury arising from the use of the information given of products mentioned or referred to herein.

The above information to the best of our knowledge is true and accurate and based upon current test data and is supplied for your guidance only. Customers should satisfy themselves to the suitability of the product in its intended use and no guarantee is given or implied since the conditions of actual use are beyond our control. ASTROflame (Fireseals) Ltd, disclaim any liability for loss, damage or other expense arising from the use of information, data or products mentioned or referred to and reserve the right to change any details or specifications without notice.


Astroflame (Fire Seals) Ltd. Intumescent House
Unit 8, The IO Centre, Stephenson Road, Segensworth
tel 0800 023 2482
(01329 844500)
fax 0800 023 2483
(01329 844600)
tel +44 1329 844500
fax +44 1329 844600



Email Astroflame