My husband and I are considering buying an Osburn 2400 and had a question for other owners of this stove. According to a salesperson today, there is an air inlet tube inside the burn chamber in the front of the stove, just beneath the lower lip of the door. I have tried to find a reference to this in the owners manual and cannot find any reference to this. If this is so, the Osburn 2400 would have a 3 point air introduction into the burn chamber - the air wash system, the secondary air tubes above, and the lower air tube at the lower lip of the door. Can anyone help that is aware of this?