NBS Source


Framed panel, single bank, louvre ventilator with horizontal intumescent blades, for internal wall or door mounting.

  • Enables secure ventilation between fire compartments. Physical free area: 74 %.
  • Fire resistance: 1 hour. At 120 ºC the blades swell to seal the vent. Unit must be sealed to substrate using fire resistant material.
  • Aluminium frame. 6 mm plastic sheathed blades at 20 mm centres. Standard or special order finishes.
  • Made to measure. Dimensions (maximum): 600 x 400 mm.
  • Thickness: 40 mm.
  • Projecting frame. Optional backframe available where unit is visible on both faces.
  • Similar model 466 is available with horizontal blades.

General information


Aluminium alloy: AlMgSi 0.5 to DIN 1748


Pr_30_59_94_31 Fire-resisting air transfer grillesPrimary


K10/115 Metal stud partition system

K10/125 Metal stud partition system

K11/890 Board

K30/110 Relocatable partition system

K30/130 Relocatable partition system

K30/135 Relocatable partition/ ceiling system

K30/150 Plasterboard panel partitions

K30/160 Plasterboard laminated partitions

L20/20 Wood flush doors

L20/230 Wood flush doors

L20/25 Wood-panelled doors

L20/250 Wood-panelled doors

L20/270 Wood doors

L20/30 Wood doors

L20/430 Wood doorsets

P21/896 Door mounted fire resisting air transfer grilles

Product range

Louvres / Fire Resistant Louvres

Specification data - Fire-resisting air transfer grilles

Product Reference

Fire Resistant Louvre Grille 466

Dimensions (w x h)

___ X ___ mm



Finish (aluminium components)

Anodized, natural

20 µ. Standard option.

Polyester powder coating, RAL colour ___, sheen ___ %

60–70 µ. Nonstandard option.

Polyester powder coating, Syntha Pulvin colour ___, sheen ___ %

60–70 µ. Nonstandard option.

Plastic sheathed blades


Standard option.

Special colour, ___

Nonstandard option.

Other requirements



Where unit is visible on both faces.

Standard product features


Aluminium alloy: AlMgSi 0.5 to DIN 1748.