the humidifier unit 11 as shown for example in fig1 4 and 6 the humidifier unit 11 as best shown in fig2 and 4 has a top wall 101 and a bottom wall 102 and sidewalls 103 104 105 106 as shown a connecting inverted u shape flange 107 is connected to the top wall 101 and is receivable over the connecting member 46 of the cube member 15 a locking detachable clamp or clasp 111 shown in fig2 and 11 connects the lower end of the humidifier unit 11 to the lower end of the cube unit 15 the bottom unit 36 of the cube unit 15 carries a plate 116 with a lug 117 and the lower plate 102 of the humidifier unit 11 carries a plate 112 with a pivoted handle 113 and a bail 114 so as to selectively lock the bail 114 to the member 117 the rear plate 102 of the humidifier unit 11 is formed with an opening 121 as shown in fig2 and 4 so as to provide an intake for the incoming air to the unit mounted inside the humidifier unit 11 is the moisture supplying unit 122 which has an upper tank 123 to which water is.