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K P Building Services has launched a trickle ventilator designed to overcome some of the problems arising in modern sealed buildings.Traditional trickle ventilators allow fresh air to enter the building and moisture to escape, reducing the problems of condensation.But they also let noise into the building, says K P. The company's new model is sound insulated to 30 dB.It has a removable and cleanable dust filter and is telescopic, allowing it to be fitted into walls up to 400 mm thick. ...

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