Keep warm while enjoying fresh air

Enjoy fresh air that’s heated by recovering the warm exhaust air that is being extracted from the home. The VELUX smart ventilation heat-recovery unit stores the heat energy of the warm exhaust air and pre-heats incoming air, optimising your indoor comfort, day and night, in even the coldest weather. The smart ventilation unit is installed above the VELUX roof window on the outside of your home, is invisible from inside and delivers over 75% heat recovery of the exhaust air.

Ventilate your home with fresh air during colder months without affecting your indoor temperature – avoid unnecessary heat loss, cold draughts and heating bills.


Always have the perfect indoor climate in your home

VELUX smart ventilation at a glance

The VELUX smart ventilation unit is a supplement to your roof window and is installed above the window. It integrates perfectly with the window and the installation is a routine task for a professional installer.

Simple installation
Fast installation
Perfect fit

How it works

Technical data

  • Technical values for the VELUX smart ventilation

    Facts and figures. (Values measured with G3 filter fitted)

    Heat recovery at a glance on a winter’s day

    Temperature (in C°)

    Average value

    Heat recovery 76%  

    Noise level in two distances from the fan/window*

    dB(A) – Fan noise compared with known everyday situations

     Levels 1 2 3 4 5 6 7 8 9
    Noise, db(A) (1m) 17 22 23 26 27 29 31 34 36
    Noise, db(A) (2m) 14 19 20 23 24 26 28 31 33

    Recommended ventilation level depending on room size 

    Room size in m2

     Levels 1 2 3 4 5 6 7 8 9
    Flow, m3/h * 11 14 15,5 17 18,5 20,5 22,5 25,5 28,5

    *Flow values will be higher without G3 filter

    Additional values:

For GGL/GGU top-operated roof windows only

  • Perfect for roof pitches 20°- 60°
  • Cannot be combined with VELUX INTEGRA® roof windows, noise-reduction roof windows or manual awning blind 
  • Can be combined with VELUX INTEGRA® electric and solar awning blind and roller shutter
  • Can be combined with manual, solar or electric interior blinds
  • Cannot be mounted in a twin window (frame distance less than 100 mm)
  • Can be installed with flashings EDZ, EDW, EDS