What is this?

This is some type of fan or blower that was in a utility room in a 70’s house? It was no longer being used, what is it?

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Just guessing but it would have nothing to do with the dryer correct?
What is on the other side of this?

Looks like a vacuum.

Central vacuum with canister missing

It used to be vented to the exterior but they removed whatever was there and spray foamed the hole. A central vacuum makes sense but there were no suction pipes installed anywhere in the home. Maybe they just attached a long hose to this??

Maybe. An unprofessional installation for sure.

I was just curious. Home from the 70’s are typically the ones that have odd appliances or devices that have been abandoned.