VELUX balanced ventilation

Always have a constant supply of fresh air, no matter how the weather is outside

With a VELUX balanced ventilation unit added to the roof window, the airflow through the flap is adjusted according to changes in wind pressure. VELUX balanced ventilation allows more air through the flap on calm days and less during strong winds, minimising drafts and boosting indoor comfort.

The innovative self-regulating ventilation unit, developed in cooperation with RENSON, is discretely integrated into the top case and works without any kind of power supply.

It’s totally unnoticeable from inside and will not obstruct your views or sunlight.

Benefits

Adapts to weather changes

Whatever the weather or season outside, the self-regulating ventilation unit constantly optimises the airflow. Manual step-control is also possible.

Improved indoor comfort

VELUX balanced ventilation has been designed to improve your indoor comfort, so that you can enjoy a constant, comfortable supply of fresh air without unwanted draughts.

Works through a closed window

A closed window doesn’t have to mean that your home is deprived of fresh air. VELUX balanced ventilation lets you refresh your home while still keeping it safe and secure – for instance when you’re asleep or away.

VELUX balanced ventilation at a glance

More fresh air

Maximises air inflow at low wind speed

Indoor comfort

Stabilises air inflow at medium wind speed

No draughts

Reduces air inflow at high wind speed

Fits both our top- and bottom-operated manual roof windows

The VELUX balanced ventilation unit integrates seamlessly with your VELUX roof window. You can upgrade your existing roof window or install a unit together with a new roof window.

The installation is a routine task for a professional installer or advanced DIYer.

Simple installation
Fast installation
Perfect fit

Two ways to optimise a natural airflow throughout your home

Maximum effect with two VELUX balanced ventilation units

Boost your indoor comfort by placing two VELUX balanced ventilation units on opposite sides of the same room, or in two adjoining rooms, to create a constant flow of fresh air. Cross ventilation will provide a noticeable improvement in your indoor comfort.

Combine a VELUX balanced ventilation unit with a fan for constant airflow

You also have the option of combining a VELUX balanced ventilation unit with an ordinary exhaust fan. Together, they create a constant flow of fresh air throughout your home.

 

VELUX innovation – RENSON integration

VELUX ventilation flap + RENSON grid = VELUX balanced ventilation

The VELUX flap

The ventilation flap is an original VELUX innovation and a feature in all VELUX windows. It allows fresh air into the room even with the window closed. Your home is kept fresh while being safe and secure.

VELUX flap + RENSON grid

The VELUX balanced ventilation unit with its RENSON-designed inlet grid adds a new dimension to the VELUX flap. The self-regulating grid constantly adjusts to changing wind pressure, allowing more air through the flap during calm days and in light breezes and less during strong, gusty winds.

Self-regulating ventilation

Here we see how the VELUX balanced ventilation unit with the RENSON grid allows more fresh air into the home on a calm day. The air is directed into the room in such a way as to reduce draughts, without the use of electricity or unsightly wiring.

 

Air flow performance (tested on a top-operated MK-size window)

 

Air volume flow [M3/h]
 
  Pressure difference [Pa]

 

VELUX balanced ventilation  VELUX standard ventilation flap
   
More fresh air in calm weather Less draught in windy weather

VELUX roof windows with VELUX balanced ventilation unit give best-in-class perfomance, boosting air flow to maximum in calm weather and reducing air flow to minimum in windy weather.

 

Technical data

  • Technical values for the VELUX balanced ventilation

The VELUX balanced ventilation unit is not compatible with VELUX INTEGRA® electric roof windows and manual awning blind MHL. Compatible with VELUX INTEGRA® solar awning blind MSL and solar roller shutter SSL.

Functions as a natural air inlet in combination with mechanical outlets - or on its own.