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Frequently Asked Questions...

Q. Will it still be possible to ventilate my dwellings using background ventilators and intermittent extract fans?

A. In most cases, yes – this is referred to as System 1. It will require the whole building background ventilation rate to be calculated in order to size the trickle ventilators, which may need to be better performing. The performance of intermittent extract fans should be 30l/s (adjacent to hob) in kitchens, and 15l/s in bathrooms. It will prove difficult to ventilate single façade flats by this method.

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