Controlled, without draft and noise and tailored to the Dutch frame assembly

Invisivent NL: natural supply of fresh air

Smart ventilation can be recognized at Renson by the '+ in ventilation'. This '+' stands for maintenance-friendly ventilation tailored to the environmental factors and the personal needs of the residents in terms of comfort and healthy indoor air. Whether the choice then falls on a system D+ (WTW - Endura Delta) or C+ (Healthbox 3.0) makes little difference in terms of energy performance. Both systems perfectly meet the requirements for BENG or for NOM houses. In the case of C+ ventilation, however, a specific window ventilation grid is required: the Invisivent NL.

Controlled supply of fresh air

Invisivent NL represents a wide range of window vents compatible to be installed on top of most common window profiles. Invisivent NL is also available in acoustic (AK Basic and AK High for 2 possible levels of sound attenuation up to 42 dB). Both acoustically insulated window vents are also available in a "High Rise" version specifically for wind-loaded applications such as high-rise buildings, apartment buildings and coastal areas. All Invisivent NL grilles can be obtained for installation on aluminium windows as well as for installation on recessed profile plastic windows.

No draft or noise pollution

Thanks to the unique design of the flap in the Invisivent NL, the supplied ventilation air is given an upward movement so that, against the ceiling, the air mixes evenly among the air already present in the room. This "Coanda effect" ensures that there is no "cold trap" or draft.

Additional flange for frame mounting

The Invisivent NL window ventilation grille is specifically tailored to Dutch frame mounting, with an additional stop profile on both the sides and top. Thus, the rubber seal of the window also extends into the ventilation grille above it, so that window and grille can be screwed directly into the wooden structural frame as one unit, perfectly wind and watertight. Aesthetically, this provides a beautiful solution that far surpasses the appearance of sus boxes and glass grilles.   

POLYCLOSE - BOOTHS 1410 & 1510