92 104 block the escape of the tube 58 from the openings 28 as long as the tube 58 is in the opening 28 upward shifting of the core module is prohibited by the tube 58 within the opening 28 to disassemble any one of the core modules 32 the strap 92 104 is first released and the upper portion of the module 32 is tipped in the direction of arrow 112 in fig6 sufficiently that the inlet tube 58 is disengaged from grommet 74 for some slight distance upon this occurring the module is moved in the direction of arrow 116 in fig7 to pull the tube 70 from the grommet 74 and separate the module from the frame if design is as per fig3 there is clearance 114 fig3 provided so that module 32 can be moved in direction 116 for sufficient distance to disengage tube 70 from grommet 74 the spatial relationship of the core module 32 and radiator frame 10 in fig6 and fig7 is exaggerated for descriptive purposes to control lateral vibrations l shaped spacers 118 fig1 are attached to the core modules to close clearances which are necessary for assembly and disassembly of core modules each spacer comprises a first leg 120 and a second leg 122 which resides between the side members 48 50 on adjacent core modules and maintains a slight spacing therebetween that is determined by the thickness of the second leg 122 an opening 124 is provided in each of the first legs 120 to facilitate assembly to.