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  Home > Fire Door Protection > Acoustic & Smoke Perimeter Seals

DB Seal Extension
DB Seal Extension DB Seal Extension DB Seal Extension

DB Seal Extension

Key Points:

  • DB seal extension and bolt
  • Suitable for double leaf timber doors
  • Acoustically tested on proprietary fire doors.
  • Noise Reduction Index Rw 35dB.

A unique solution to fitting rebated flush bolts in conjunction with drop down seals. The DB SEAL Extension works as an extender with the Astro DB Seal Plus (Rw 35dB) drop down seal. 10mm maximum drop and the seal is manually lowered on the handle side.

Also available are 150mm Stainless Steel Flush Bolts (AFASDBX/FBBOLT) with radiused ends designed to work with the DB Seal Extendsion.

Symbol Guide


  • Dimensions and Schematic Diagram.

Dimensions and schematic of rebated drop-down door seal with flush bolt

Product Option

Our Price: £17.39

Prices include VAT.


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