In a closed room there is no provision of fresh air coming into the room. The oxygen already present in the air of that room shall be gradually consumed. Moreover if more number of people are sitting in that room the percentage of oxygen will go on decreasing and the percentage of carbon dioxide will go on increasing by continuous use of oxygen during respiration. If in such a room there is angithi also then it is positively harmful for the persons sitting in the room. It is because burning of coal or wood in the angithi would consume oxygen very rapidly. Also it produce poisonous gases like carbon monoxide in addition to carbon dioxide.
