[Nathan]

I would use a bathroom fan, either a cabinet model with the grille on the bottom or an inline model if you already have a grille set up. Either of these can be bought from any home improvement store. They will all be sold with a CFM rating atached to them which is a misnomer because it will depend on static pressure drop but it will give you a good comparison. 115v single phase is pretty standard for them so they will run on the power you have in your house and most of them are permanent split capacitor or partially shaded motors so you can get a potentiometer type speed controller to control the flow. Broan-NuTone has numerous lines that you could use.