This fan was used for about four weeks eight years ago. It was a necessary but temporary installation. Its use was supplanted by individual heaters on each floor of the four story building that it was placed in. It was mounted by being suspended from a custom metal stand using the exhaust fan and piping shown above. The stand and the the fan are available if the buyer would like them. It was a very expensive model when I purchased it. The contractor had no problem spending my money. For all intents and purposes, this unit is practically new. It is a heavy unit. The power rating is 400,000 / 325,000 (in / out). Delivery can be arranged.