Hey Happy New Year!

Would it be a reasonable assumption that you could take a Greenheck utility set fan like the USF and put an exhaust stack on it?

I would have.

Unfortunately, it would be a bad assumption, so I’d be wrong too. The construction of the fan and discharge connection do not account for the load of the stack (wind or gravity). If you specify vibration isolators with the fan, those don’t account for a stack either.

People learn this the hard way. The additional load on the fan discharge may cause the fan shroud to deform, leading to mechanical interference (wheel rubs on the inlet cone no matter what you do) or bearing failure. If your situation requires an exhaust stack, the only way to avoid this is to build a separate support for the stack. No fun!

If you need a stack for a small or medium utility set fan, then may we suggest the FumeJet pre-engineered system with integral stack? Good to 115 mph without guy wires!