end of the u shaped coil 16 it will be appreciated that the principles of the invention are applicable to coil units for heat pumps having forms other than that shown in fig1 an appreciation of how the invention can be applied in a coil unit having a cabinet with rounded corners rather than square corners is shown in fig4 in which the corner post 54 has a shape in horizontal cross section corresponding to the contour of the rounded corner the vertical part of the post 54 has the same general type of construction as the vertical part of the corners 30 in that an inner member is nested within an outer member and attached to each other in a way which provides the grille edge receiving recess along each vertical edge of the post 54 the bottom part of such a post 54 necessarily has to be different from that of post 30 since there is no room to accommodate inwardly projecting parts regardless the unit may be shipped with the corner post 54 in a position in which the bottom of the post abuts the downturned flange 56 of the bottom pan and is so secured for shipping purposes a pair of z shaped brackets 58 for each corner post is shipped with the unit at the job site the lower end of the post 54 is pulled out and the z shaped brackets are secured to the flange 56 and the.