Optimising the performance of passive stack ventilation
Installed at the top of a ventilation duct, the VBP hybrid fan guarantees a satisfactory airflow all year long on a former natural ventilation installation. By creating additional pressure when the natural draught is not sufficient, as may sometimes happen in warm and hot weather, the VBP hybrid fan optimises the working of natural ventilation while leaving its dimensions unchanged (ventilation exhaust units and air ducts). Its patented principle is specially designed to allow both mechanical and natural exhaust modes: the exhaust fan can works at very low speed when the stack effect is sufficient without creating any pressure loss. Its motor speeds up when the temperature increases, to compensate for a potential loss of stack effect. With a consumption of only a few Watts per dwelling, the VBP hybrid fan is an excellent alternative to mechanical exhaust ventilation and natural ventilation. Its sizing makes it suitable for apartment blocks up to 7 storeys.