In the case of surface suction, the flow rate is greater than the vacuum.
Unlike aspiration at the soldering tip, a pipe system with a large diameter is required here.
A pipe diameter too small would unnecessarily increase the flow resistance and reduce the suction power accordingly.
For this reason, Weller proposes for the suction of the surface "piping systems 50, 60, 75 mm".
In the case of decentralized systems, this system also makes it possible to carry out long pipe paths without loss of power.
For central systems directly at the workstation, the suction hose of 50 with the corresponding connection parts is sufficient.