Just in the thinking stage of designing and building an extractor and hoped to get some experienced feedback on the good and poor features of comercial units. I am gravitating to an upright radial design in the 16 to 32 frame size range with a ~2hp DC motor with variable speed controller. Have machiening and welding equipment on hand and have fabbed enough stuff out of metal to feel this is doable for me. Priced out new stainless, not cheep, but I think I can put together motor, controller and the materials for about $1000 wich is well less than it would cost to get into a new unit. Any thought on features you wish your extractors had or things that you are glad the do have?