Lorient LVV40S Intumescent Air Transfer Grille 300mm x 300mm

Lorient LVV40 Intumescent Air Transfer Grille 150 x 150mm

Lorient Intumescent Air Transfer Grilles are suitable for ventilation in fire compartment walls or doors. Certifire approved.


Product Code ATG150

58 in stock

Next day delivery available


Lorient Intumescent Air Transfer Grilles are used to provide an answer to situations where ventilation is required in fire compartment walls or doors. They can be used for providing dampers in ductwork.

  • Can be used to provide resistance to fire and hot smoke of up to 60 minutes in doors and walls.
  • Excellent airflow characteristics which result in silent efficient operation in normal use.
  • Complete seal achieved in approximately five minutes when tested in accordance with BS476 Parts 20/22
  • Can be used with a cover grille for a neat finish and extra privacy.
  • Allows bi-directional air flow.
  • Simple to install.
  • No maintenance required.
  • Holds Certifire CF564 certification.
Product Code: ATG150


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.