Does anyone know what this is?

I put it in this section because I am inclined to think it is some sort of space heater? Thanks in advance!

Wait…is it an abandoned exhaust fan?

Looks like a space heater vent to me.

direct vent.
No appliance connected /abandoned.

A fan-powered sidewall vent for a heating appliance of unkown type.

Thanks for the confirmation. There was a brand new HE furnace so this must have been for the old obe