có lối vào buồng thang từ mỗi tầng đi qua khoảng thông thoáng bên ngoài nhà theo một lối đi hở, Lối đi qua khoảng thông thoáng này không được nhiễm khói
There is the entrance to the lift Chamber from each floor comes through about outside ventilation accordinga walkway openings, paths through about this not being ventilated pollution
with entrance into the lift from every floor ventilation passing around outside the house under an open passageway, through around-ventilated room is not contaminated smoke