Seals

At Knowles, we offer a variety of seals to suit your application including a range of fire, smoke and acoustic intumescent strips.

The door clearance is calculated by adding a gap between the frame and the door, allowing the door to open and close with ease. This gap is essential in the design of a door but can be a contributing factor to the exposure to smoke, noise and dust.

The purpose of
Intumescent seals

The intumescent strip is fitted in either the door or frame, and can be supplied with a brush or finn design to prevent smoke leakage.

The intumescent seal works by expanding when exposed to heat, sealing around the edge of the door to the door frame. The intumescent seal holds the door in place and prevents any exposure to the flames and hot smoke, providing resistance to fire, smoke and sound.

This contains the fire for a period of time dependent on the size and type of the strips used

Intumescent Seals in Fire Door

Intumescent Seals

The Intumescent seals are contained within a plastic carrier which is available in a range colours to match or contrast to the finish of the door frame. They can also be supplied with either a finn or brush to stop cold smoke leakage around the edge of the door. 

Dependent on the size and type of the strips used, the fire will be contained for a period of time – for example FD60 will retain a fire from burning through to the door for at least 60 minutes.

All our intumescent strips are manufactured in accordance with BS 476: Part 22: 1987.

In addition, we also offer a variety of seals including a range of fire, smoke and acoustic intumescent strips. All intumescent strips have NHBC approval.  

Single Finn Design

  • Performance
  • Fire Resistance
  • Properties & Design

Provides fire, smoke and acoustic resistance.

Performance in accordance with Certifire technical schedules as outlined in CF822.

Single Finn design is available in a range of fire resistance systems. 

Including: 30 Minutes, 60 Minute, 90 Minutes and 120 Minute fire resistance. 

Fire Resistance Properties

  • Integral Finn options available [Triple Finn & Side Finn].
  • Streamline aesthetic design.
  • Increased tamper resistance
  • Durable – Finn will not remove from seal
  • Identification on each product ensures full traceability
  • Available in a range of 6 standard colours 

Twin Finn Design

  • Performance
  • Fire Resistance
  • Properties & Design

Provides fire, smoke and acoustic resistance.

Performance in accordance with Certifire technical schedules as outlined in CF822.

Twin Finn design is available in a range of fire resistance systems. 

Including: 30 Minutes, 60 Minute, 90 Minutes and 120 Minute fire resistance. 

Fire Resistance Properties

  • Integral Finn options available [Triple Finn & Side Finn].
  • Streamline aesthetic design.
  • Increased tamper resistance
  • Durable – Finn will not remove from seal
  • Identification on each product ensures full traceability
  • Available in a range of 6 standard colours 
Brush Single Seal design

Brush Single Seal Design

  • Performance
  • Fire Resistance
  • Properties & Design

Provides fire and smoke resistance.

Performance in accordance with Certifire technical schedules as outlined in CF822.

Brush Single Seal design is available in a range of fire resistance systems. 

Including: 30 Minutes and 60 Minute fire resistance. 

Fire Resistance Properties

  • Streamline aesthetic design.
  • Increased tamper resistance
  • Durable – Flipper will not remove from seal
  • Identification on each product ensures full traceability
  • Available in a range of 3 standard colours 
Plain Intumescent Seal

Plain Intumescent Seal

  • Performance
  • Fire Resistance
  • Properties & Design

Provides fire resistance.

Performance in accordance with Certifire technical schedules as outlined in CF822.

Plain Intumescent  Seal design is available in a range of fire resistance systems. 

Including: 30 Minutes and 60 Minute fire resistance. 

Fire Resistance Properties

  • Streamline aesthetic design.
  • Increased tamper resistance
  • Durable – Flipper will not remove from seal
  • Identification on each product ensures full traceability
  • Available in a range of 3 standard colours 
Intumescent Single Flipper

Single Finn Design

Intumescent Seal Double Flipper

Twin Finn Design

Brush Single Seal design

Brush Single Seal

Plain Intumescent Seal

Plain Intumescent

Internal Doors designed & crafted with style in mind

Acoustic Seals

The purpose of an acoustic seal is to offer sound reduction. The robust internal mechanism allows for parallel actuation, whilst a complete overhaul to the seal profile provides for the most durable seal yet, which is even more resistant to seal delamination.

Explore our of NORSEAL© range of seals below

Concealex A8100 Superior Seal

Concealex A8100 Superior Seal

Nor810 Acoustic Seal

NOR810 Automatic Drop Seal

Concealex A8100 Superior Seal

Concealex A8100 Superior Seal

  • Performance
  • Acoustic Performance
  • Properties & Design

Provides fire and acoustic resistance.

Fire Tested: For 30 & 60 minutes to BS EN 1634-1: 2014

Smoke tested in accordance with BS EN 1634-3: 2004

Acoustic tested in accordance with BS EN ISO 10140-2: 2010

The Concealex A8100 Superior Seal provides an acoustic performance up to 51dB. 

Acoustic Properties Icon

  • Fire Tested to BSEN 1634/1
  • Fire Resistance to 30 and 60 minute specifications
  • Sound Insulating seal in self-extinguishing thermoplastic.
  • 14mm Maximum Drop
Nor810 Acoustic Seal

NOR810 Automatic Drop Seal

  • Performance
  • Acoustic Performance
  • Properties & Design

Provides smoke and acoustic resistance.

Smoke tested in accordance with BS 476-31.1.

Acoustically tested in accordance with BS EN ISO 10140-2.

The NOR810 Seal provides an acoustic performance up to 54dB. 

Acoustic Properties Icon

  • Parallel Drop Technology
  • Silicon rubber seal
  • Seal drop up to 20mm
  • High durability will not tear from its holder

Our Suppliers

At E & S W Knowles we have a network of suppliers, meaning we can offer a range of finishing options for your bespoke doors. 

Click on the Brochure to download your copy to explore each range.

NORSEAL Seal Solutions

Click on Brochure to download PDF.

Exitex Fire Protection Seals

Click on Brochure to download PDF.

Exitex Acoustic Seals Range

Click on Brochure to download PDF.