A related question is here about a year ago: Is there any reason to not tape this vent over?
My question is, why do they put the vent there in the first place. Like the previous poster, I just bought a house and the A/C duct has a vent right above the A/C unit, cooling down a utility room that contains a sump pump and nothing else at this point. The rest of the basement is finished, but the utility room is closed off by a door.
It seems like there is no problem in taping that up but I am curious what was the logic of having it in there in the first place.