Fwiw - the sort of squirrel-cage fan you point to may work, but only b/c you are loading the blower with a lot of back-pressure and reducing the flow. 430CFM will blow green beans right out of a 5" pipe [it's above the bean terminal velocity ~15m/sec], and moreso once roasted. Further it takes ~58kW or 200kBTU(/hr) to heat 430 scfm of air to 480F. !
So in reality you can't likely heat more that say 100scfm to roasting temps w/o a massive heater, and you can spout (not lift) a bean bed with a lot less than that - IF you design the chamber right.
Many consider the 2-stage blowers (like Lamb Ambetek central vac blowers) with ball bearings to be a better choice. The cfm rating is lower,and the flow doesn't drop-off quickly with back pressure.