Breathe Better. Live Smarter.
Healthy Homes delivers innovative ventilation solutions designed for the Nordic lifestyle-smart, energy-efficient, and built to improve your indoor air quality. With people at the heart of everything we do, our systems don’t just ventilate homes-they enhance lives.
Demand-Controlled Ventilation
Demand-controlled ventilation means ventilating where and when needed, and for the right reasons. The aim is to find a balance between the perfect indoor climate and energy saving.
A demand-controlled ventilation system cuts heating losses by up to 60%.
When the air quality is good, running ventilation at full capacity is unnecessary, wastes energy, increases heating costs and accelerates wear and tear on the system.
However, it's crucial that the ventilation system immediately responds to declining air quality, addressing issues precisely when and where they arise until optimal air quality is restored.
Ensuring the health and comfort of residents.
Health & Air Pollution
On average, the air inside our homes is ten times more polluted than outdoor air, yet we spend up to 90% of our lives indoors.
When this polluted air becomes trapped in airtight, well-insulated houses, it creates the perfect environment for mould growth, unpleasant smells and condensed surfaces. Over time this can trigger respiratory issues, eye irritation, headaches, allergies, reduced concentration.
Did you know that sleeping in a poorly ventilated bedroom can fragment your rest—raising nighttime awakenings and cutting into deep, restorative sleep—further compromising both comfort and long-term health?
Why Ventilate?
Everyday activities like cooking, showering, and even breathing release moisture, odors, and CO₂ into the air.
Ventilating your home is essential because it continuously replaces stale indoor air — often filled with moisture, CO₂, VOCs, and allergens — with fresh outdoor air, diluting pollutants and preventing the damp conditions that promote mold and mildew.
This air exchange protects your health by reducing the risk of asthma, allergies, and headaches, while also controlling humidity to protect your home’s structure from condensation damage.
Moreover, maintaining optimal air quality supports better sleep, improved concentration, and greater overall comfort in your home.
Healthbox
Innovative demand-controlled mechanical extraction ventilation
- Smart and demand-controlled airflow: CO₂, humidity, and odors are continuously measured, with automatically adjusted airflow per room for optimal comfort and minimal energy use.
- Airflow up to 475 m³/h
- “Breeze” night-cooling mode
- Belgian-made quality and a 5-year warranty when installed by certified partners

Smart Zone
With the unique Smart Zone principle, Healthbox measures the air quality in each room of the home and adjusts the ventilation airflow per room as needed.
If the residents are watching television in the evening, the system increases extraction in the living area.
At night, the system detects rising CO₂ levels in the bedroom and increases extraction of polluted air there.
Natural air supply and mechanical extraction are thus balanced to ensure good air quality in every room — promoting a healthy and restful night’s sleep.

The benefits of an exhaust system
- Since fresh air is supplied through vents in the façade walls, ducts are only necessary for the exhaust. This reduces the impact on the building and makes installation easier.
- Energy-efficient and effective operation: the system increases ventilation only when and where necessary. The fact that it operates silently is an added bonus.
- Effectively and fully automatically regulates the extraction of polluted air based on the current air quality in each zone individually.

Easy installation
Adaptable to your needs
Healthbox 3 is designed to be adaptable to different types of homes – both new constructions and renovations. You can connect up to 11 zones (rooms) and expand the system as your needs change.
Compact and Flexible Installation
Thanks to its compact design, Healthbox 3 takes up minimal space and can be mounted on a wall, ceiling, floor, or suspended – perfect even for smaller spaces.
Do you have an uninsulated attic?
Healthbox, together with an insulated box and insulated ducts, works perfectly in that environment.

Technical specifications
App |
|
Breeze function |
|
CE certified |
|
Demand driven |
|
Smartzone |
|
Connection diameter | Ø80, Ø125, Ø150 |
Sensors detection of air quality | H₂O sensor, VOC sensor, CO₂ sensor |
Height (mm) | 200 |
Width (mm) | 390 |
Other Features
Automatic software updates | When the device is connected to the internet |
User & installer app | Availiable on Android & iOS |
Fire safety (internal) |
|
EU declaration of conformity |
|
Energy performance regulation (EPB) | – Reduction factors conform to Table 1 of the flat-rate table |
Energy rating |
|
App-connect

Always a clear view
on air quality in your room

See the history
of your indoor air quality

Personalize ventilation
according to your needs

Get personal tips to improve
your indoor climate

Or get insights on how smart ventilation
automatically takes care
Flux+ Flat
Demand-controlled mechanical balanced ventilation
- Smart and demand-controlled airflow: CO₂, humidity, and odours are continuously measured, with automatically adjusted airflow for optimal comfort and minimal energy use.
- Airflow up to: 370 m³/h
- “Breeze” night-cooling mode
- Belgian-made quality and a 5-year warranty when installed by certified partners

Heat recovery
A balanced ventilation system keeps your air healthy and your energy bills low by combining:
- Mechanical supply of fresh, filtered air
- Mechanical, demand-controlled extraction of stale indoor air
Between the two, there’s a built-in heat exchanger that makes all the difference:
- It recovers heat from the outgoing air
- It transfers that warmth to the colder incoming air
So while your ventilation system runs continuously to protect your indoor climate, it does so in the most efficient and cost-saving way possible — giving you comfort without compromise.

The benefits of a balanced system
Renson’s balanced ventilation system enhances fully mechanical heat recovery ventilation with intelligent demand control.
- Fresh outdoor air is preheated using the warmth from extracted indoor air via a built-in heat exchanger — helping you reduce heating costs.
- High-performance filters remove pollen, dust, and other pollutants from the incoming air for a healthier indoor environment.
- Air supply and extraction are automatically and efficiently regulated based on real-time air quality in each zone.

Easy installation
- Perfect for tight spaces – compact, low-profile design
- Flexible installation – mount on ceiling or wall, horizontally or vertically
- Easy setup by one person – Quick-Fix bracket included
- Service access in seconds – unit tilts into maintenance position
- Convertible – switch from left to right configuration

Technical specifications
App |
|
Breeze function |
|
CE certified |
|
Demand-driven |
|
Heat recovery |
|
Connection diameter | Ø160 |
Sensors | H₂O sensor, VOC sensor, CO₂ sensor |
Type of execution | Left-hand version, Right-hand version |
Height (mm) | 745 |
Width (mm) | 300 |
Other Features
Automatic software updates | When the device is connected to the internet |
User & installer app | Availiable on Android & iOS |
Fire protection (release pressure in system with valves shut) |
|
EU declaration of conformity |
|
App-connect

Always a clear view
on air quality in your room

See the history
of your indoor air quality

Personalize ventilation
according to your needs

Get personal tips to improve
your indoor climate

Or get insights on how smart ventilation
automatically takes care
FAQ
Poor ventilation can cause a buildup of dust particles, allergens, and mold in your home. This affects everyone—but especially children, who have developing immune systems and breathe more frequently than adults.
High levels of carbon dioxide (CO₂) indoors can lead to tiredness, poor sleep, and difficulties concentrating or learning. Mold exposure can irritate your airways and may trigger asthma or allergies.
Long-term exposure to bad air and lack of fresh airflow can weaken your immune system and negatively impact your overall well-being and quality of life.
Ventilation is essential for keeping indoor air fresh, dry, and healthy. If you notice condensation on windows, feel that the air is stuffy, or smell mustiness, it may be a sign of poor ventilation.
Other warning signs include waking up with headaches or feeling tired in the morning. These symptoms often mean your system isn’t supplying enough fresh air or removing moisture and pollutants effectively.
In some rooms, the need for a good ventilation system is greater than in others.
This includes your bathroom, where humid air can cause a range of issues. A less obvious example is your bedroom, where the air quality has a major impact on your sleep, and where CO2 levels can rise pretty quickly due to the air you breathe out at night.
It's also a good idea to fit an extraction system for humidity, CO2 and odours in other wet rooms such as the toilet (odours), the kitchen (odours, humidity, CO2) and basement (humidity).
On the other hand, you'll need to ensure a supply of fresh air from outside in so-called 'dry' rooms, such as your living room and bedrooms, to replace the polluted indoor air that is extracted via the wet rooms.
Think of it as cruise control for fresh air. Tiny sensors track CO₂, humidity and odours in your home. When the air is already good the system idles, saving energy and noise; the moment cooking steam, shower moisture or extra people appear, it automatically ramps up until the air is fresh again - then powers back down.
No dials, no guess-work.
With Healthbox's SmartZone technology. Up to 11 separate rooms can be monitored and ventilated individually, the system “follows” your family around the house.
Because the fan rarely runs at full blast. Renson’s Healthbox 3.0, for example, can cut heating losses by up to 60 % compared with a fixed-speed system.
Independent research on residential demand-controlled ventilation shows similar figures (in energy-use reduction) across many studies.
Less wasted warm air = lower utility bills and a smaller carbon footprint.
A properly insulated home stops the heat from getting out — but in doing so, it also stops polluted air from getting out. For that reason, proper ventilation is more important than ever before to create a healthy indoor climate.
Renson is going one step further by offering demand-driven solutions. These systems constantly monitor the air quality via built in sensors and automatically spring into action only where and when needed. From your breakfast and morning shower to your evening watching TV and a healthy night’s sleep: Renson is your partner for healthy and comfortable living.
The free app lets you see air-quality history, tweak settings or use extra features such as the Night Breeze cooling mode etc.
However, the systems are fully automatic and doesnt need any actions from the homeowner in order to deliver healthy fresh air 24/7. Using the app is fully optional.