These homes were also warmed by a centralized hearth, a fire pit with an air deflector, and side vents and a smoke hole in the roof provided fresh air and evacuated smoke. The placement of the home's entrance varied by locality and archaeological period. Early homes utilized the ventilation stack as an egress by means of a ladder. Later homes expanded the pit into a keyhole shape to create a low sheltered entrance. Interior space was often loosely divided into two rooms, one for storing personal and dry goods and the other as living quarters. Many pithouses included an antechamber, containing storage bins or pits.