Invisivent has launched the Evo self-regulating flap ventilator, which has been developed to provide ventilation without draughts or noise.

The ventilator is designed to sit above an aluminium, timber or uPVC window frame and is available in the Futuro version for contemporary buildings or Classico for more traditional designs.

The unit has a height of 62mm and is thermally broken with a self-regulating flap that reacts automatically to wind pressures to ensure a constant volume of air circulating in the building space. This, says the company, prevents draughts and saves on energy. The airflow can be controlled manually by means of an internal lever in six stepped settings - open, closed and four intermediate positions.

In the open position, the incoming airflow is directed upwards to avoid creating draughts. A mesh, which can be removed for cleaning purposes, prevents insects from coming in. When the ventilator is closed, it is water- and wind-resistance up to 650Pa, the company says.

The unit is available in a satin anodised finish or can be powder-coated in any RAL or Syntha Pulvin colour. It can also be ordered made to measure or in lengths of 6,000mm.