Through Wall Ventilation

Telescopic underfloor ventilators are used to provide a free airflow below suspended ground floors. 1500mm² per m run of wall is required and this can be achieved by spacing vents at no more than 2m centres with vents not more than 450mm from the ends of the wall. Ventilators should be positioned down two opposite sides of a building so as to provide a cross flow ventilation and help to prevent stagnant air pockets.