I have a finished basement, with 3 original vent down below and one return vent on ceiling around 1000SQF
I am dividing a room in there , so I called an HVAC person to help add extra vents
he added one in and one return in that new room
he also added another one from the main duct in the living space, so now I have total of 4
He told me that code says not to have a return in the basement if the room is not enclosed?
is this true. Will this cause positive pressure in the basement and could cause mold and other issues?