NO need to attempt to "re-invent the wheel" and mix and match your own fan and speed controller.There ALL SORTS of choices for variable speed or thermostatically speed controlled vent fans for livestock buildings. Local hog confinement barns near here have them as well as a friend"s turkey barns, for example. Don"t know the brand names, offhand, but GOOGLING "Variable speed confinement building fan" will get you started.
There's some educational resource links at the end of the .pdf linked below.http://learningstore.uwex.edu/Assets/pdfs/A3784-06.pdf
MORE info:http://www.munters.com/upload/Related%20product%20files/controls-5000seriesliterature.pdf This post was edited by Bob at 10:07:46 03/01/13 3 times.