HI, I was cleaning my stove (Astoria) and took a few minutes to take off the back panel and noticed that the OAK pipe ran to the stove where just inside the grate the air intake line had a rectangle piece missing. Meaning when the air intake sucked air it would get it from the easier of the outside or my house. Is this correct? Seems like the outside air kit intake line should not have a hole in it. I can take a picture put I was hoping someone could confirm that I should cover that hole or leave it open. I can't imagine why it would be open with the OAK installed though.