How to Choose the Right Ventilation Controller or Sensor for Your System
How to Choose the Right Ventilation Controller or Sensor for Your System
Choosing the right ventilation controller or sensor can make your system easier to use and help it respond more effectively to changing conditions inside your home or building.
Depending on the ventilation system, controls can range from a simple boost switch to humidity, CO₂ or occupancy sensors that automatically adjust ventilation when required.
The right option depends on the type of ventilation system you have, how you want it to operate and, most importantly, whether the controller or sensor is compatible with your particular unit.
Why Do Ventilation Controls and Sensors Matter?
A ventilation system needs to provide enough airflow to remove excess moisture, stale air and indoor pollutants.
Controls and sensors determine how that airflow is managed.
Some systems use simple manual controls, while others can automatically increase ventilation when they detect higher humidity, occupancy or changes in indoor air quality.
The main benefits can include:
- Easier control of ventilation rates
- Automatic boost when additional ventilation is required
- Improved response to humidity or indoor air quality
- Greater user convenience
- More control over how and when the system operates
For projects in England, Approved Document F states that ventilation should be controllable and that controls can be manual or automatic. It also identifies humidity, occupancy and pollutant sensors as examples of automatic controls for continuously running ventilation systems.
Start With Your Ventilation System
Before choosing a controller or sensor, first identify the ventilation system and model you have.
Controllers are often designed for specific units, product ranges or manufacturers, so a control that works with one MVHR unit will not necessarily work with another.
Ventilation Superstore stocks controllers and sensors for systems including:
- MVHR
- MEV
- PIV
- Extractor fans
The range includes products from ventilation brands such as Vent-Axia, Zehnder, Airflow, Nuaire, Komfovent, Duco and others.
Always check the product compatibility information before ordering rather than choosing a controller based on appearance or function alone.
Manual Controllers and Boost Switches
A manual controller is one of the simplest ways to change how a ventilation system operates.
Depending on the unit, a controller may allow you to:
- Select different ventilation speeds
- Activate boost mode
- Adjust system settings
- View operating information
- Access timer or scheduling functions
A separate boost switch may also be used to temporarily increase airflow when more ventilation is needed.
This can be particularly useful in moisture-producing areas such as kitchens and bathrooms.
For example, a boost function can increase extract airflow during showering or cooking before returning the system to its normal continuous ventilation rate.
Humidity Sensors
A humidity sensor monitors the level of moisture in the air.
When relative humidity rises above the sensor's programmed threshold, the ventilation system can increase airflow automatically.
Humidity control can be particularly useful in areas such as:
- Bathrooms
- Shower rooms
- Kitchens
- Utility rooms
This allows the system to react to activities such as showering, bathing, cooking or drying clothes without relying entirely on the occupant to activate boost mode manually.
For systems that support humidity-based control, this can provide a convenient way to manage periods of increased moisture.
CO₂ Sensors
Carbon dioxide levels can increase when a room is occupied, particularly where several people are using an enclosed space.
A compatible CO₂ sensor can monitor indoor CO₂ levels and signal the ventilation system to increase airflow when required.
These sensors can be useful in:
- Living rooms
- Bedrooms
- Offices
- Meeting rooms
- Classrooms
- Other regularly occupied spaces
Rather than operating at a higher ventilation rate continuously, demand-based control allows compatible systems to respond as indoor conditions change.
PIR and Occupancy Sensors
PIR sensors detect movement or occupancy.
When somebody enters a room, the sensor can trigger a compatible ventilation system or activate a higher ventilation rate.
This type of control can be useful in spaces where occupancy is intermittent, including:
- WCs
- Bathrooms
- Utility areas
- Commercial washrooms
- Other occasionally occupied rooms
Occupancy control can reduce the need for users to remember to operate a manual switch.
Wired or Wireless Controls?
Depending on the ventilation system, you may have a choice between wired and wireless controls.
Wired Controls
Wired controls are physically connected to the ventilation system.
They can be a good choice for new installations where cabling can be planned during construction or first fix.
Wireless Controls
Wireless controls can provide greater flexibility because additional control cabling may not be required between the switch or sensor and the unit.
This can be particularly useful for retrofit projects or where installing new cabling would be difficult.
However, wireless compatibility varies between manufacturers and systems, so always check that the controller is designed to communicate with your ventilation unit.
Smart and Digital Controllers
Some modern ventilation systems offer digital or touchscreen controllers with more advanced functionality.
Depending on the product, these may provide access to features such as:
- Fan speed adjustment
- Boost settings
- Operating modes
- Scheduling
- Filter notifications
- System status
- Indoor air quality information
- Installer settings
Some ventilation systems can also be controlled through an app or connected platform.
Not every household needs an advanced controller, however. If you only need simple boost control, a basic switch may be more practical and cost-effective.
Choose the level of control that suits the way the system will actually be used.
Consider Where the Sensor Will Be Installed
The location of a sensor can affect how effectively it works.
For example, a humidity sensor needs to be positioned where it can accurately respond to changes in room moisture without being obstructed.
Similarly, a PIR sensor needs a suitable field of view to detect occupancy.
Always follow the manufacturer's installation instructions relating to:
- Mounting height
- Room position
- Distance from vents
- Electrical requirements
- Wireless range
- Sensor calibration
Avoid positioning sensors behind furniture or other objects that could interfere with their operation.
Don't Mix Incompatible Controls and Units
Compatibility is one of the most important considerations when buying ventilation controls.
Even if two controllers perform the same basic function, they may use different electrical connections, communication protocols or control logic.
For this reason, check:
- The manufacturer of your ventilation unit
- The exact model or range
- The controller or sensor compatibility information
- Whether additional modules or receivers are required
- Whether the control is wired or wireless
If you are replacing an existing controller, using the model number of both the ventilation unit and original control can make it much easier to identify the correct replacement.
Remember to Maintain and Test Your Controls
Controllers and sensors should also be included in routine ventilation maintenance.
Dust or obstruction around a sensor can affect how well it responds, while boost switches, timers and smart controls should be checked periodically to make sure they are still operating correctly.
Our guide on how to maintain and clean your ventilation system includes steps for checking controls and sensors alongside filters, vents, ductwork and other system components.
Keeping the entire system maintained helps ensure the controls are working alongside a ventilation system that can actually deliver the required airflow.
Which Type of Ventilation Control Is Right for You?
| Control Type | Best For |
|---|---|
| Manual Controller | Direct control over ventilation modes or fan speeds |
| Boost Switch | Temporarily increasing ventilation when extra airflow is needed |
| Humidity Sensor | Automatically increasing ventilation when moisture levels rise |
| CO₂ Sensor | Responding to changes in indoor air quality and occupancy |
| PIR Sensor | Triggering ventilation when movement or occupancy is detected |
| Digital Controller | More detailed system settings, monitoring and operating information |
| Wireless Controller | Flexible control where compatible wireless operation is available |
Find Controllers and Sensors at Ventilation Superstore
Ventilation Superstore stocks a range of ventilation controllers and sensors for MVHR, MEV, PIV and extractor fan systems, including manual controllers, boost switches, humidity sensors, CO₂ sensors, PIR controls and digital interfaces.
Browse the available controls by brand and system type to find a compatible option for your ventilation setup.
