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Residential ventilation

Find out more about CHRV solution for residential buildings



Venitlation systems ensure optimal climate conditions by providing a fresh, healthy and comfortable environment for buildings of all sizes and different applications.

In a completely closed room in a building, air cannot easily enter or leave, causing air pollutants to remain and accumulate there. This could impact the health of people in the room. Ventilation is essential for diluting and removing there air pollutants.

A well-maintained ventilation system and adequate air-exchange rate have been demonstrated to be an effective solution to protect people from contaminants, including viruses.

Those pollutants are generally:

  • CO2
  • Humidity
  • Chemical emissions (VOC)

We measure CO2 and Relative Humidity this way:

  • CO2 (PPM):
    CO2 is a gas present in the air produced by any living organism when they breathe. The average concentration of CO2 in ambient air is 300-400 ppm.
Illustration about the average concentration of CO2.


  • > 1200ppm = the indoor air quality is POOR
  • 1000-1200 ppm = the indoor air quality is ACCEPTABLE
  • < 1000 ppm = the indoor air quality is HEALTHY
    Is the ratio of the partial pressure of water vapor to the equilibrium vapor pressure of water at a given temperature.
Illustration about the relative humidity.


  • > 70% = the air is TOO HUMID
  • 30-70% = the air is GOOD
  • < 30% = the air is TOO DRY

CHRV Technology Concept

Concept Of 'Centralized Heat Recovery Ventilation' (CHRV)

Illustration that shows the 2 zone ventilation system

2-Zone Ventilation System

Sensors closely monitor the occupant’s presence and activity in the dwelling by means of CO2 and/or humidity sensors. This allows for an automated detection of when to ventilate, where to ventilate (day-zone or night-zone) and how much to ventilate.

Controlling both zones separately with a built-in valve substantially reduces consumption by the EC fans, which translates into the highest energy reduction and an A+ energy label.


Main Advantages of CHRV Technology

Energy Efficiency

  • Fresh air passes through heat exchanger before being supplied
  • Bypass for free-cooling capacity
  • Possibility of 2-zones control system

Indoor Air Quality

  • High capacity of filtration
  • CO2 / Humidity sensors




DUCO unit


  • Allows the return air to pass most of its heat to the incoming fresh air in winter time
  • Possibility to pre-heat the fresh air in winter time


DUCO offers end-to-end solutions

One-stop-shop for your end-to-end ventilation solution

Complete range of Centralized Heat Recovery Ventilation (CHRV) units, ducts & accessories.

Smart demand control

The room is only ventilated when necessary and in the correct amount. CO2 concentration and air humidity are used as indicators. This helps avoiding unnecessary heat loss while guaranteeing an optimal indoor climate.

One of the quietest systems

A comfortable indoor climate is created by whisper- quiet ventilation systems. DUCO excels in acoustics both in its supply and exhaust airs.


Automatic calibration

The automatic calibration, whereby the measuring and adjustment technology is based on the principles of calibration under constant pressure, always offers a 100% guarantee of a qualitative end result and translates into a 50% saving in set-up time for the installer.


With the optional Communication Print you have the option of allowing the DUCO ventilation systems to communicate via ModBus and/or Ethernet. ModBus integration enables them to be linked to a building management system.

High energy conversion efficiency

The combination of dynamic air distribution filters and high performance heat exchangers result in very high efficiency ratio.


Only at Daikin

A woman relaxing on the couch

Thanks to DUCO, Daikin offers Centralized HRV systems with an integrated 2-zone valve. With the 2-zone version of the DucoBox Energy Premium, Daikin’s product range is extended with a unique ventilation system with embedded 2-zone control. If a certain zone does not require ventilation, that zone is not ventilated. Cost savings on heating, lower consumption and noise comfort of the unit itself (lower rpm) are the logical consequences.

Sensors meticulously detect the residents’ movements throughout the home. This makes it possible to automatically determine where, when and in what amount ventilation is required.

By controlling the two zones separately with a built-in valve, the consumption of the EC fans is reduced considerably, which translates into an A+ energy label.


  • Optimal indoor air quality in the most energetically optimised manner thanks to 2-zonal control
  • Quietest ventilation system on the market
  • Automatic calibration

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