FAQs

Our fire resistant air transfer grilles are constructed with intumescent material contained within the slats of the grille. In the event of a fire, the intumescent material expands, forming a solid block to stop the passage of fire. This video shows an LHV44 intumescent air transfer grille in a fire test. This sequence happens in real time from the point the furnace is lit.

Our fire and smoke resistant air transfer grilles (ATGs) work in the same way as a fire resistant ATG, but they also incorporate an electro mechanically operated smoke shutter mechanism. In the event of an alarm condition, or power failure, the shutters close, preventing the passage of cold smoke. The smoke shutters can be seen in action here: https://vimeo.com/389931199

The Lorient LVV40 is a fire resistant air transfer grille. It is constructed from PVC slats with an intumescent core; when exposed to heat, the intumescent expands to form a solid block to stop fire from spreading. The Lorient LVH44 is also a fire resistant air transfer grille, but it is constructed from Z275 grade galvanised steel, and therefore suitable for external applications.

Yes, our air transfer grilles have been tested with timber, mineral composite and steel fire doors. Simply filter the ATG Product Selector to 'doors' to view all of our tested applications: http://lorientuk.com/grilles/results

Yes, the LVV40 and LVH44 fire resistant air transfer grilles and the LVV40S and LVH44S fire and smoke resistant air transfer grilles can be used in FR flexible walls. More information can be found on our ATG Product Selector App here: https://www.lorientuk.com/gril...

Yes, we have a number of tested solutions for both circular and rectangular plastic and steel ducts. Simply filter the ATG Product Selector to ‘ducts’ to view all of the tested applications: https://www.lorientuk.com/gril...

Our fire resistant air transfer grilles offer protection against fire and hot smoke. For cold smoke protection, a fire and smoke resistant air transfer grille with Talkback Damper System would be needed.

The Talkback Damper System is a centralised status monitoring control unit that is designed to work with up to 16 fire and smoke resistant air transfer grilles, including: LVN20S, LVN25S, LVV40S, LVH20S and LVH44S. A unique 2-way communication system operates between the Damper Control and Monitor Unit (DCM) and the air transfer grille actuators. These are connected, via a control panel, to a standard fire alarm system. In the event of an alarm condition, or power failure, the shutters close, preventing the passage of cold smoke.

Yes. An extra optional audio warning device (AMS) can be connected to the DCM wiring circuit.

Yes, the Talkback system can link to both the fire alarm panel, from which the alarm trigger is taken and the BMS. By linking to the BMS, the Talkback system (through use of AMS module) can alert the BMS to any faults.

Yes, a separate battery backup can be installed within the Talkback system to cover short term power loss, this is only available from Lorient.

The Talkback DCM wiring instructions and fault finding chart can be found here.

Yes, our Talkback system includes a Damper Control Monitor (DCM) which is required as it communicates with the individual fire and smoke control ATGs and notifies the user if a smoke control shutter malfunctions. The DCM uses a multiplex signal to communicate with the ATG’s, which allows it to monitor each ATG’s state and also cycle them every 24hrs to ensure the system is fully functional.

The free area characteristics of our air transfer grilles can be found here.

With our LVH44 high performance intumescent air transfer grille, we have the production flexibility to make bespoke sizes, so please call us on +44 (0)1626 834252 to discuss exactly what you need.

For larger apertures, the LVH44 can also be installed as part of a modular system, up to a maximum size of 1800mm x 600mm for 120 minutes fire protection in a rigid wall application (600mm x 600mm for floors). Please contact us if your application exceeds these sizes.

Only if the fire door has been fire tested with more than one aperture. This is normally in the form of vision panels. The total size of the apertures should not exceed the allowable aperture size as part of the doors test evidence.

For humid environments we would suggest our LVH range of ATG’s as the intumescent is not hydroscopic.

We would suggest our LVH range of ATG’s for external walls. We also do a WHF75 weather louver for external applications.

An intumescent liner is normally recommended for use with our fire and smoke resistant air transfer grilles when used in fire doors. Otherwise, Lorient intumescent sealant is recommended to seal that gap around the fire rated air transfer grille. Our ATG installation manual will state what the required method is for sealing each type of air transfer grille.

In some cases, a smoke control shutter LVHCTD can be added within a duct to provide smoke protection to an existing fire rated air transfer grille fitted within the same duct. Details of this can be found on page 22 in our Fire and Smoke resistant air transfer grilles brochure.

In most cases, Lorient fire test air transfer grilles without cover grilles which gives the option to fit cover grilles if required. This can be a Lorient cover grille or a similar cover grille supplied by another manufacturer. However, if a fire and insulation rating is required, then Lorient cover grilles are required as part of the system.

If an intumescent sealant is required to seal the gap around Lorient ATG’s, Lorient intumescent sealant should be used as this is what was tested with our fire rated air transfer grilles.

Yes, we offer a professional and expert air transfer grille commissioning service for fire and smoke dampers. We check and test the installation and components of your air transfer grilles; and issue a fully detailed service report, highlighting status and compliance. Call us on +44 (0)1626 834252 to discuss.

You can buy from us directly - if you don't have a credit account with us, then it will be on a proforma invoice basis.

However, it may be easier and more beneficial for you to buy through one of our ATG Approved Stockists.