Originally Posted by SeekingNirvana
Just open the doors and let the ports blow the room out!
That joggled loose a simmering realization and what you said is not really far-fetched - you actually can use a ported box as a fan.
Years ago I was showing off a new ported sub to a friend and fellow mechanical engineer.
I was playing a 35 Hz sine wave at high level and told him to feel the air near the port.
He looked around the box for other openings and asked in wonderment "Where's the air coming from?!"
I told him it was just an illusion because it was AC flow.
That's true but it's highly asymmetric, like the airflow at the inlet and outlet ports on a shop vac; the former draws in air from all directions at low average velocity outside the port and can only be felt within several inches, while the latter shoots the air in a high velocity directional stream for many feet.
I'm sure a port behaves the same way, and this is supported by a conversation I had years ago with the dislustrious Carlos Beltran (designer of Acoupower high end sub drivers).
I asked him how his cooling system could be effective when the voice coil area can't breathe in both directions - wouldn't it just draw in the hot air it just squirted out?
The answer was no; same as above, most of the air that's squirted out is ejected far away, and cool air from all directions nearby is drawn in.