We stock every part for the Neptronic SDU Blower pack ever made. The blower pack consists of a small fan and a steam distribution nozzle in a small cabinet. It is bolted to the top of a steam humidifier. The typical application for this accessory is when you do not want to or can not install a steam distribution nozzle in the existing duct system. This accessory makes the humidifier a stand alone device for humidifying a single room. Our technical support team can assist you should you have any questions about your Neptronic SDU Blower pack. Order from the source of Neptronic Steam humidifier tanks and parts just like the contractors do.