Channel fan to incorporation in attic directly in ventilation duct. Is much suitable to varmeflytningsystem. What recommended to fasten fan with montageklemmer as purchased separate , sa it powerful engine vibrations not transferred to ventilation duct. Fan have two step, past, the laws can regulated either by two phases directly through one switch on either 145 or 187 m3 h. Contrast can fan not controlled by one external stepless regulator. Type: db no.. Hint no.. Kanalventil...
