BD exhaust air chimneys are available with several different diameters and can therefore be adapted to any ventilation concept and spacing of roof trusses.
They are made of 30 mm thick polyurethane pipes coated with smooth, glass-fibre reinforced polyester. This means that all BD chimneys are well-insulated, condensation water is prevented and noise is reduced.
The chimney pipes are delivered in halves (VC) and are assembled on site, thus saving transport costs. They are, however, also available as full pipes (AF). A roof sheet seals all chimneys.