NATURAL VENTILATION (previously known as System 1) Intermittent Extract Fans with background ventilators Suitable for less airtight dwellingsA design air permeability higher than 5m³/(h¹·m²) at 50Pa.An as-built air permeability higher than 3m³/(h¹·m²) at 50Pa.Intermittent extract fans should be provided in the following locations.Kitchens.Utility rooms.Bathrooms.Sanitary accommodationIt also requires correctly sized and fitted trickle...
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