Flue gas motors and chimney fans for the top of the chimney, for stoves, open fireplaces and boilers that draw badly. Here you find the Darco GCK and GCKV for ø150 and ø200 and the Kutzner + Weber chimney fans (Diajekt, Injekt and AirSpeedy) for flues from ø100 to ø350, with adapters and controllers.