Fan sensors and switches are essential components of ventilation and HVAC systems. They enhance control, efficiency, and compliance with UK Building Regulations. Sensors monitor environmental conditions, while switches initiate or automate fan operation. Together, these devices improve indoor air quality, energy efficiency, and comfort across residential, commercial, and industrial applications. In the UK, their specification and installation must comply with Building Regulations Part F (Ventilation), Part L (Conservation of Fuel and Power), and relevant British Standards for electrical and safety compliance.
Types of Fan Sensors
Temperature Sensors
These sensors monitor ambient temperature and regulate fan operation when thresholds are exceeded.
Humidity Sensors
Humidity sensors measure moisture in the air and trigger fan operation during periods of high humidity.
Motion Sensors
Motion sensors detect occupancy and activate fans accordingly, reducing wasted energy use.
Smoke and Air Quality Sensors
These sensors detect smoke, VOCs, or poor air quality, automatically activating fans to remove contaminants. In commercial and industrial applications, they contribute to safety and must align with Approved Document B and BS EN 12101 standards where linked to smoke ventilation systems.
Types of Fan Switches
Manual Switches
Basic on/off switches allow users to control fan operation manually.
Thermostatic Switches
These switches activate fans automatically when set temperature thresholds are reached.
Timer Switches
Timer switches allow users to pre-set operation periods, reducing unnecessary energy use.
Smart Switches
Smart switches integrate with smart home or building management systems. They can be controlled via smartphone apps or voice commands, supporting BS EN 15232-1 for building automation.
Benefits of Fan Sensors and Switches
✔ Energy Efficiency – Automated operation reduces unnecessary usage, supporting Part L compliance.
✔ Improved Air Quality – Sensors maintain
good IAQ by responding to temperature, humidity, and pollutant levels.
✔ Enhanced Comfort – Automatic responses
ensure consistent indoor conditions.
✔ Safety and Compliance – Smoke and air
quality sensors contribute to safer environments and regulatory compliance.
Applications of Fan Sensors and Switches
• Residential – Bathrooms, kitchens, attics, and living areas for airflow management and comfort.
• Commercial – Offices, retail, and restaurants to improve air quality and reduce energy use.
• Industrial – Warehouses and factories to enforce safety standards and support COSHH/LEV systems.
• Agricultural – Greenhouses for optimising temperature and humidity control.
Choosing the Right Fan Sensors and Switches
Selection should match the environmental conditions and intended application. Consider whether manual, automated, or smart controls are required, and confirm compatibility with the fan model and installation. For commercial and industrial applications, ensure compliance with BS EN 60204-1, BS 7671, and UKCA marking requirements. In smoke control systems, ensure compliance with Approved Document B and BS EN 12101.
Maintenance Tips for Fan Sensors and Switches
• Keep sensors free of dust and debris to ensure accurate readings.
• Inspect wiring and connections regularly for safety and reliability (BS 7671 compliant).
• Test sensor and switch functionality periodically to ensure correct operation.
• Replace batteries in wireless sensors when required.
• For workplace LEV systems, ensure inspection and testing at least every 14 months under COSHH requirements.
As sensors are a fairly technical and varied subject we’ve pulled together a table of some of the relevant standards designers and buyers need to be aware of. Please note there may be more and this guide is not a replacement to consulting approving authorities or professional consultants.
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