The non-return valves provide air flow in one direction only, without reducing significantly the efficiency of the fan.
- Diameter: 100mm; - Material: plastic.
Advice from
Bathroom ventilation buying guide
Ventilating your bathroom helps to reduce excess humidity, which is essential for protecting the surfaces of your bathroom and avoiding health issues. From whole-house ventilation systems to window or wall-mounted extractor fans, read on for tips on how best to ventilate your bathroom.