support base 20 of this embodiment includes eight main body leg portions 22 including four main body leg portions 22 disposed at four corners these eight main body leg portions 22 are disposed so that four main body leg portions are disposed at each of both sides of the main body base plate 21 in the horizontal direction perpendicular to the cooler axis as illustrated in fig1 and 3 the first auxiliary support table 30 includes a base plate 31 a plurality of leg portions 32 a first cooler support portion 36 and a second cooler support portion a suspending portion 37 the first auxiliary support table 30 supports the first and second coolers 54 a and 54 b while being connected to the main support base 20 the base plate 31 is a part that includes a placement surface 310 formed at the upper end thereof so as to be widened in the horizontal direction the base plate 31 has the same configuration as that of the main body base plate 21 that is the base plate 31 has a rectangular shape in the top view and is formed so that an iron plate 312 or the like is placed on a frame 311 formed of shaped steel such as channel steel or h shaped steel the first cooler 54 a is placed on the base plate 31 and the second cooler 54 b is disposed below the base plate 31 furthermore in fig3 the iron plate 312 illustrated in fig2 is omitted so as to illustrate the configuration of the frame 311 further each of the number of the coolers placed on the base plate 31 and the number.