Lorient LVH44 - 150 x 150mm Intumescent Grille

Lorient LVH44 – 250 x 250mm Intumescent Grille

Heavy duty intumescent air transfer grilles designed for use in the aggressive environments often found in industrial premises.

  • Can be used to provide fire resistance of up to 180 minutes.
  • Complete seal achieved in approximately two minutes when tested in accordance with with BS467: Parts 20/22
  • Exhibit excellent airflow characteristics and give silent efficient operation with normal to high air velocities.
  • Can be used in ducting where the steel and aluminium casing protects the intumescent material from the corrosive effect of hot gases travelling at high velocities.
  • Can be used in high humidity.
  • Have a steel frame which contributes to fire resistance by preventing the inward deformation of surrounding structures thus protecting the intumescent materials.
  • Resistant to vibration damage.
  • Suitable for horizontal and vertical applications.
  • Suitable for external applications.
  • Suitable for use in numerous applications – doors, walls, ducts, floors and ceilings.
  • Holds Certifire CF564 certification.


Product Code LVH44 - 250

8 in stock

Next day delivery available


  • Up to 180 minutes fire resistance
  • Complete seal achieved in as little as 2 minutes
  • Excellent airflow characteristics
  • Can be safety used in ducting
  • Suitable for use in both horizontal and vertical applications
  • Suitable for external applications

On average 388 people are killed and 11,100 are injured* in fires each year in the UK alone.  Many of the casualties are attributable to breathing the toxic products of combustion from a remote fire.

Fire and smoke also cause extensive damage to building fabric and contents. £2.52 billion per annum is the estimated total of fire-related losses. The majority of these deaths, injuries and losses occur in buildings where fire and smoke protection measures have been inadequate.

When fire breaks out in a building the threat is twofold. Firstly, there is the fire itself and the hot smoke generated in the immediate vicinity. Secondly, there is cold smoke which will spread rapidly through the building, threatening people and property some distance from the fire. The Building Regulations take both these threats into account, and supporting documents give criteria for how they can be managed. Details can be found in Approved Document B (England & Wales), Technical Booklet E (N Ireland), and Technical Handbook Section 2 (Scotland).

The Regulations require large buildings to be divided into smaller fire and smoke resistant ‘compartments’, to reduce the risk of damage to the building as a whole and also to save lives in the case of a fire. Building a fire resistant wall or floor to make a compartment is relatively simple. However, building design becomes much more complex when the compartments need to be linked in some way – essential to make the building usable. Every time an aperture is cut into one of the compartment boundaries (for example, to install a door in a fire resistant wall, or to pass ductwork through a wall or ceiling) the aperture must be filled with something that will preserve the fire and smoke integrity of the compartment. That’s the role of Lorient’s products – to work with the surrounding elements of the building to preserve the integrity of the fire and smoke resistant compartments. Our fire and smoke seals can be fitted into fire rated doors; our glazing products can be fitted into doors, screens or fire rated partitions; our air transfer grilles can be installed into doors, walls and ducts.

Fire and smoke protection products must be tested to prove their performance, and indeed, separate tests are required for fire and smoke.

Our solution is to fit fire containment air transfer grilles at the point of penetration. Under normal circumstances these allow air to pass freely between compartments. In the event of fire the slats and framing components swell to many times their original thickness, fusing together to form a non-combustible mass which provides fire resistance to match the surrounding construction and prevents the passage of hot smoke and gases. The fire containment air transfer grilles contain no moving parts which results in low maintenance.