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A glass-replacing ventilation hatch (for glass thicknesses from 24–48 mm) which provides efficient cooling of any building due to the supply of large ventilation flow rates. It consists of a single module, although it contains two essential components. Ten-year warranty.

From outside, the DucoGrille NightVent is protected by a window louvre with perforated louvre blades (DucoGrille Solid 30Z P1) that act as an insect screen. On the inside, an insulated opening panel with a flat-finished inner panel makes for easy integration into the interior. In addition, the acoustic attenuation ensures that the thermal value of the ventilation hatch is comparable to that of a closed window.

The ventilation hatch can be hinged horizontally or vertically and the inner and outer panels can be finished in various colours. It is available in motorized and manual versions and has been tested under the applicable European regulations by means of intensive tests covering wind and water resistance. In addition, the external louvre grille is also available in a vandal-proof or intrusion-resistant version up to RC2 class.


Window glass replacement ventilation.

Related literature

The following content references this product:

Standard product features


  • Internal and external: Aluminium, Al Mg Si 0.5.
  • Thermal interruption: Polyvinyl chloride (PVC).
  • Insulation: Polyisocyanurate (PIR).

Louvre pitch:

37.5 mm.

Frame depth:

115 mm.

Sound attenuation value Rw (C;Ctr):

  • Open: 10 dB (0;-1).
  • Closed: 33 dB (-1;-4).

Ventilation performance:

  • 369 L/s/m² (at 2 Pa).
  • Visual free area: 60%.
  • Physical free area: 34%.
  • Ce: 0.2.
  • Cd: 0.2.
  • K-factor inlet and outlet: 24.51.

Water resistance:

  • 0 m/s air velocity: Class A.
  • 0.5 m/s air velocity: Class B.
  • 1 m/s air velocity: Class C.
  • 1.5 m/s air velocity: Class D.
  • 2 m/s air velocity: Class D.
  • 2.5 m/s air velocity: Class D.

Air density (when closed):

Qn50 = 3.6 m³/h/m².

Water resistance (to BS EN 12208 and BS EN 1027, when closed):

Class 9a.


1.5 W/m²K.

Motor (electric operation):

  • Noise: <35 dB (A).
  • Operating temperature: -25 to +60°C.



– Electric:

An electric actuator can open/ close the ventilation hatch via a wired or wireless user controller, or fully automatically based on CO2 and temperature measurements (if used in a Duco Tronic (Plus) System). The ventilation hatch can therefore be opened at any time, even if no one is in. In addition, the DucoGrille NightVent can be linked to the building management system (BMS).

Finish/ Colour:

  • Anodized: Qualanod-compliant, coating thickness 15–20 µm, standard natural colour (clear anodizing).
  • Powder coated: Qualicoat-compliant, minimum average coating thickness 60–80 µm, standard RAL colours with 70% gloss.

NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
45-25-50/305 Aluminium louvre panel units

NBS Specification

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This product is associated with the following NBS clauses:

Product specification

An important note about specifying



Duco Ventilation & Sun Control NV


+44 (0) 333 772 7734

Product reference

DucoGrille NightVent

Size (w x h)

[ ______ ]


Fitted with one or two handles - insert requirement.

Finish/ Colour

[Powder coated, RAL]
Insert colour requirements.

Flange width

[24 mm]
[28 mm]
[32 mm]
[36 mm]
[40 mm]
[44 mm]
[48 mm]


[Not required]
Fine punching keeps insects out.
[Stainless steel mesh, 2.3 x 2.3 mm]
Resistant to insects, vermin and birds.

Intrusion resistance (to BS EN 5096 and BS EN 1627)

[Not required]

Manufacturer details

Handelsstraat 19,
8630 Veurne,
Tel +44 (0) 333 772 7734
Fax +32 58 330044
NBS Plus