Check Valve ORNO BF-100/VALVE for Fans Ø100 mm

ORNO BF-100/VALVE is a check (non-return) valve engineered for ventilation fans with a 100 mm duct diameter. Designed to fit inline and wall-mounted fan installations, the valve prevents reverse airflow when the fan is switched off and helps maintain correct airflow direction in residential and light commercial ventilation systems. The compact design allows straightforward integration into standard 100 mm ductwork, reducing drafts and limiting odor ingress from connected ducts.

Advantages

The valve offers reliable one-way air flow control with low resistance during fan operation and effective closure when the fan is idle. Its construction ensures stable performance over repeated cycles and minimal impact on fan efficiency. Installation is simple and compatible with common 100 mm ventilation fittings, while the lightweight design reduces load on mounting points.

Suitable for

• Bathroom and kitchen exhaust fans with 100 mm ducting
• Inline duct ventilation systems to prevent backdrafts
• Wall-mounted fan installations where odor or cold air ingress must be limited
• Residential and light commercial ventilation applications

Key specifications

• Duct diameter compatibility: 100 mm
• Function: check (non-return) valve for airflow control
• Installation type: inline or wall-mounted duct insertion
• Material characteristics: lightweight construction suitable for standard ventilation use
• Operational behavior: allows airflow in one direction and closes to prevent reverse flow

How to use

Insert the valve into a 100 mm duct segment in the correct orientation so that the flap opens toward the direction of intended exhaust flow. Secure the valve using appropriate duct clamps or mounting fittings to ensure an airtight connection. Verify that the valve moves freely and fully closes when the fan is off. Periodically inspect for dust or debris accumulation that could impede movement and clean as needed to maintain proper function.

Usage recommendations

For optimal performance, install the valve as close to the fan outlet as practical and ensure the duct run is as straight as possible with minimal bends. Avoid locations where heavy condensation or excessive grease may accumulate. Regular visual checks and occasional cleaning will extend reliable operation and help maintain airflow efficiency.