The drier that I built measures 4 x 8 x 4 (in the goode Kings' English). 128 cubic feet of drying room. Does that count? :-) Mine is built with 2 x 4 framing, a lining approved for kitchens (basically a tough plastic), 2" styrofoam insulation, radiant fin tubing powered by a residential gas water heater set to max, expansion tank, and temp probes. Air exchange is done by a draft inducer motor, internal circulation by duct boosters. Have had 'okay' luck with it. Took some head scratching to get the internal chamber temp up high enough for quicker drying (extra insulation, wrapped pipes, shorter plumbing runs, more air flow over the radiant fins). Happy to converse at length on more specifics if needed. 'Course then you'll probably compete against me & run me out of business ;-) -Jim C MWPH