Reading through this thread has me thinking about my 3hp Super Dust Gorilla installation. I had originally thought about venting it outdoors but decided against the air loss and connected the filter system to it inside by the DC. It works great as far as picking up chips, etc., even if I have multiple ports open.

When I have the unit on, there is a noticeable heat rise in the shop after a very few minutes. During Winter months, that's a good thing, of course. Being in the South, I'm now wondering if I'd be better off exhausting the DC outside the shop so I eliminate most of the heat load. I'd be pushing some of my cooled air out, but the reduced heat contribution of the DC might improve the cooling efficiency. Venting to the outside would also reduce the fine dust particles in my shop air. I'm far enough from any neighbors for dust and noise not to be a problem. Plumbing wouldn't be too much work since the exhaust port and filter are already on an outside wall.

Just kinda thinking out loud.