Home > Companies > Lorient Polyproducts Ltd > Vision Style Grilles

Standard vision intumescent air transfer grille for walls, doors and rectangular or circular ventilation ducts.

  • 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 BS 476: 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.

Related literature

The following content references this product:

Standard product features


40 mm thick.

Free area:

  • LVV40: 60% approximately.
  • LVC40: 60% approximately.
  • LVV40S: 30% approximately.



Grilles are available in a range of widths and heights from 100–600 mm in 25 mm increments. Larger sizes can be produced dependent upon application - please refer to Lorient's Technical Department.

Smoke control system:

The LVV40S is designed to be used with the Talkback smoke control system. The Talkback system can control up to sixteen dampers/ shutters and features a status monitoring display.

NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
45-25-38/330 Fire-resisting air transfer grilles

Product specification

An important note about specifying



Lorient Polyproducts Ltd


+44 (0)1626 834252

Product reference

[Lorient intumescent fire damper, vision style Ref: LVV40]
[Lorient intumescent fire damper, circular, vision style Ref: LVC40]
[Lorient intumescent fire and smoke damper, non-vision style Ref: LVV40S]

Fire resistance

[30 minutes]
[60 minutes]


[Not required]
[As drawing ___]
[200 x 200 mm]
[300 x 300 mm]
[400 x 400 mm]
[450 x 450 mm]
[500 x 500 mm]
[600 x 600 mm]




 - Finish:
[Timber, ash]
[Timber, beech]
[Timber, ramin]
[Timber, utile]
[Timber, Columbian pine]


 - Grille:
[Not required]
 - Material:
[Pressed steel]
 - Finish:
[Natural satin anodized]
[Primed for site painting]

Fitting: Screwed and bedded in Lorient intumescent mastic

 - Mastic colour:

Smoke control system

[Not required]

Manufacturer details

Endeavour House,
Fairfax Road,
Heathfield Industrial Estate,
Newton Abbot,
Devon, TQ12 6UD
Tel +44 (0)1626 834252
Fax +44 (0)1626 833166
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