VENTILATION

Pukekohe & Waiuku Times, Volume 9, Issue 499, 23 January 1920, Page 1

VENTILATION

The best form of ventilation In a room was declared by Professor G. Owen, in an address delivered at Auckland the other night, to be ? fireplace. He said that constant ventilation was necessary in a room ocn: ed by human beings as carbonic id gas was produced by breathing. There were always about three-parts of carbonic acid gas in every 10,000 parts of air, but if the proportion exceeded six parts in 10,000, then we were apt to suffer. Hence it was necessary to constantly change air. Ventilation was the problem of admitting fresh air without causing draughts. A fireplace was the best ventilating device, as it induced a constant flow of air up the chimney. Professor Owen said an open fireplace was the least economical method of heating a room, a stove being much more • efficient. In the case of a stove, the source of heat was in the room, and the air was warmed by direct contact with the stove. In the case of an open fireplace, the gases heated by the fire escaped up the chimney.