Air duck from basement to the attic
I brought a "new" house, that house was built in 1982 and in the basement there is a pipe that raise right to the attic, there is a small metal register in the ceiling of the basement. They said me that it's to remove humidity and it's acting like a cheminey in summer, I have to cap it in the attic before the winter come...
If I install an A/C should I permanently close that pipe? If I increase ventilation in the attic, by adding an attic ventilator or some high performance passive air ventilator for the attic, will this pipe draw my relatively cool air right to my attic?
That was the first time I heard of this passive system, could some one explain in detail what it's for and if it still recommended to operate it and what have replaced this system since then ?
Thanks in advance