I just have a regular range hood over my brew pot and HLT. I had to go cheap so bought it off craigslist ($15... new in box). I think it is fairly low CFM so I may replace it in the future.
Regular, inexpensive range hoods are not a good application. Inexpensive hoods typically have very low CFM ratings, and cannot remove enough moisture, particularly from a basement room.
Here's my installation. I'm fortunate in that I don't have finished ceilings in my brewing area. Pics are clickable thumbs:
This fan is available
HOME DEPOT
Fan, ductwork, exterior exhaust vent, etc. were less than $125. I'd recommend NOT skimping on an exhaust system; you'll just end up installing a proper system, and risk moisture damage to building construction materials.
You can view the product specifications including size and installation instructions
HERE.
The fan is rated at 160CFM, which blows away the typical residential kitchen range hood. I too have hardwood floors above my brew area and excess moisture was also a concern. I've brewed over 6 times already with this ventilation, and have experienced ZERO moisture problems such as stained floor joists or odors permeating the rest of the house.
Electric brewing is THE way to go for indoor applications. Check out my system
HERE.