Bathroom extractor fan ORNO BF-125/HT 125 mm with humidity sensor and timer switch

ORNO BF-125/HT 125 mm is a bathroom extractor fan designed for reliable ventilation of bathrooms and small wet rooms. The fan integrates a humidity sensor and a timer switch to control operation automatically: it activates when humidity rises above a set threshold and continues to run for a preset interval after humidity levels fall. The compact 125 mm design supports wall or ceiling mounting in residential and commercial environments to reduce moisture, limit condensation and help prevent mold formation.

Advantages

The built-in humidity sensor provides automatic control without the need for manual switching, ensuring the fan operates only when necessary. The timer switch allows delayed shutdown for continued ventilation after showering or other moisture-generating activities. Its 125 mm size offers a balance of airflow capacity and compact installation footprint suitable for small rooms. The product is intended for straightforward electrical connection and discreet integration into typical bathroom interiors.

Suitable for

• Bathrooms in private homes and apartments
• Small en-suite rooms and shower rooms
• Toilets and utility rooms with elevated humidity
• Small commercial washrooms and staff facilities

Key specifications

• Impeller diameter: 125 mm
• Integrated humidity sensor for automatic start/stop
• Adjustable timer switch for delayed shutdown
• Wall or ceiling mounting capability
• Designed for ventilation of bathrooms and small wet rooms

How to use

Install the fan on a suitable wall or ceiling surface in compliance with local electrical codes and mounting recommendations. Connect to the mains supply according to the wiring diagram provided by the manufacturer and set the humidity threshold and timer duration to the desired values. The fan will start automatically when relative humidity exceeds the selected threshold and will switch off after the timer delay once humidity returns below the threshold. For service or adjustment, disconnect power before handling the unit.

Usage recommendations

Position the fan to ensure effective extraction of humid air from the shower or bath area, and avoid locating it where airflow would be obstructed. Set the humidity threshold to a level that activates the fan during typical post-shower conditions and choose a timer delay that allows sufficient residual ventilation to clear moisture. Regularly check and clean the grille and impeller to maintain airflow efficiency.