If several Humisonics are to be installed into the same duct , it is necessary to arrange them within the duct so as to obtain a homogeneous and constant atomization.Suggested installative layouts are:• “On line” layout: units are positioned on different levels along the same vertical section. The diagram 13.a shows the minimum distances for humidifiers placement within the same duct. Quotas don’t change, even if the deflector used is D as Fig. 1.b.