I have a belt drive. I bought it and used a lot, did something where I had to fix it and sized a couple pieces better and turn it from 40 inch to 30 something and reduced the flow quite a little. It conserved some heat mostly This gets a filter in front of it. I had fixed the thing, ha and put too much power to it and bent something and it made too much wind anyway so,,,, I took snips and cut 3 inches off the end of the blades, straighten it up and bought a new strip and zip it omnb with a 210 and spooly, they reflashed the outside to fit.