Call us: 01329 841 416
Fast Delivery on all in stock items

Fire Door Seals - Aluminium

Sealmaster IMN/IMP 30min double door seal

Sealmaster IMN/IMP - 30 Minute Fire & Smoke Seal | Stormflame

Sealmaster IMN/IMP 30min double door seal

£31.15 £25.96 (ex. VAT)
Two part fire and smoke seal for protecting double doors | Sold in 1050mm lengths | IMN is a Fire & Smoke Seal - IMP is a fire only seal. IMN and IMP seals sold separately.

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:

  • IMN/IMP - 30 Minute Fire & Smoke Seal
  • Two part fire and smoke seal for protecting double doors
  • BS476 part 22.
  • A fire and smoke seal from Sealmaster. 
At the meeting stiles the seal consists of two opposing extruded aluminium alloy profiles - IMN and IMP - each with twin reservoirs which contain substantial reserves of Sealmaster intumescent material. IMN also holds a self-extinguishing elastomeric blade, which rest against IMP when the doors are closed. At the head and hanging stiles IMN is used on its own with the smoke seal making contact with the door or frame.

In new doorsets, both profiles are rebated into the centre of opposing door edges at meeting stiles. Where IMN/IMP is fitted to an existing door assembly, the stiles of the door are easily rebated. The seal is interrupted at the hinges and lock/latch striker plate positions, and protection at these points is normally not essential for FD30S doors (see BS 8214).

Normal Use
In normal use, the elastomeric blade seals the gap between the doors, and acts as an efficient draught seal.

An IMN/IMP combination seal with elastomeric blade insert, has been tested on a double leaf, timber door assembly by TRADA. A fire resistance in excess of the 60 minutes was achieved. Copies of test results are available on request.


  • Sold and priced in 1050mm lengths
Certification/Fire Test Reports:
  • IMN/IMP fire and smoke seals have been tested and approved by Certifire to conform to BS476 part 22. This is the most demanding 3rd party certification scheme in the industry.
  • As the fire develops, the elastomeric blade provides a barrier to the passage of smoke and hot gases. Once the fire reaches the IMN/IMP seal, the intumescent material foams, swells and fills the gaps between the doors. Since the foam remains soft during the period of intumescent action, it exerts minimal pressure, allowing the doors to remain in their original positions.


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.

  • Product Code:
  • MPN:
product review overlay image

Customer reviews

No reviews left yet
Write a review

No reviews have been left for this product, be the first to leave a review