Huge air returns into basement
I have 2 large air returns on my main floor that lead directly into the basement. I also have air return vents on my main floor that run through ducting into the furnace, but these vents are literally just holes in the floor that lead to the basement and are covered by a vent.
It’s and older house and I am going to be replacing the flooring. Is there any issue with getting rid of these vents?