NSHEV Glass Louvres

NSHEV Glass Louvres FLW Range

The FLW smoke vent range has multiple advantages, whether it’s bespoke sizes, glazing specification or thermal performance. These EN 12101-2 certified louvre windows offer numerous economical and aesthetic advantages.

Performance Features

  • NSHEV certified in accordance with EN 12101-2.
  • Programmable electric drive functions through SCS software.
  • Additional passive and active anti‑trap protection system for the main closing edges with reversing function.
  • Can be glazed into curtain walling or directly into structural openings.


Louvre frames have mitred corners with internal brackets and screw-fixed. Louvre blades are centre-pivoted and close flush with the external vent frame.

Thermally broken aluminium extrusions. Frame sections have mitred corner with internal brackets and press-formed.

Double or triple-glazed or insulated aluminium panel with a total thickness of 23-40 mm. Including EPDM gaskets.

Concealed rack and pinion mechanism provides easy to use, maintenance free, smooth and synchronised operation of the louvre blades.

Technical Data

Barrier Load tested BS 6180:2011
Impact resistant In accordance with DIN 18032-3
Security In accordance with EN 1627:RC2.
Visible frame width (louvres) 21 mm (FLW 32) / 28 mm (FLW 40)
Visible frame width (vent) Horizontal 20 & vertical 40 mm (FLW 32) / Horizontal & vertical 40 mm (FLW 40)
Frame depth (louvres) 49 mm (FLW 32) / 51 mm (FLW 40)
Frame depth (vent) 77 mm (FLW 32) / 85 mm (FLW 40)
Maximum frame width 2500 mm
Louvre blade height 200 to 450 mm (FLW 32) / 200 to 500 mm (FLW 40)
Coefficient of discharge Cv. Max. 0.57
Wind load classification up to WL 3000
Resistance to heat classification B 300-E
Reliability classification Re 1000
Low ambient temperature classification T (‑05)
Air permeability class (EN 12208) Class 4 (FLW 32) / Class 4 (FLW 40)
Watertightness class (EN 12208) Class 7A (FLW 32) / Class 8A (FLW 40)
Tested sound reduction (Rw) 41 dB
Thermal performance (glazed option) U-value options to 0.8 W/m2K


Go to Top