Method for feeding in and transporting material in a pneumatic conveying system for material, which conveying system comprises at least one input point (60) of material, a material conveying pipe (100), which can be connected to the input point (60), and a material container (10, 50), in which the material being transported is separated from the transporting air, and also means for producing a partial vacuum/a pressure difference and/or a transporting air current in the conveying pipe (100) at least during the transporting of the material, which means comprise at least one partial-vacuum source (30). In the method the suction side of the partial-vacuum source (30) is connected to act in the conveying pipe (100) and onwards to an input point (60) arranged in the conveying pipe, or to act at least in the feeder channel (81) that is between the conveying pipe and the input point, in which case the input point (60), or at least the feeder channel (81), intended for emptying that is closest to the material contain
