. Natural and artificial methods of ventilation. )(;ist Slintt.Horizon!a! Foul Air Irimk.Connecting Pipes from FouAir Flues. EC FF Foul Air Flues. Foul Air E.its from Ward into Foul Air Flue.s F.V..Fre.sh Air Supply Duct carried along Centre of Ceiling.Discharge Tubes.. Rluk—Presh air supply.^K!.l.(>w—Products of combustion. ■J Brown—Products of respiration.Red—Products of respiration frompatient. Downward ventilation returns the vitiated respired air to be rebreathed, also the poisoiiouftproducts of combustion. Only an unendurable and highly dangerous down draught couldprevent the hot res

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. Natural and artificial methods of ventilation. )(;ist Slintt.Horizon!a! Foul Air Irimk.Connecting Pipes from FouAir Flues. EC FF Foul Air Flues. Foul Air E.its from Ward into Foul Air Flue.s F.V..Fre.sh Air Supply Duct carried along Centre of Ceiling.Discharge Tubes.. Rluk—Presh air supply.^K!.l.(>w—Products of combustion. ■J Brown—Products of respiration.Red—Products of respiration frompatient. Downward ventilation returns the vitiated respired air to be rebreathed, also the poisoiiouftproducts of combustion. Only an unendurable and highly dangerous down draught couldprevent the hot respired air ascending to a height sufficient to ensure its rebreathal. Withthis system the patients in a hospital inhale foul air only. If the foul air exits are placedeither above, below, or at the side of the bed, the results are the same, also when the freshair is forced in al the upper parts of the side or end walls, or is projected up on to the ceiling. Mi VI. Compaj^ative Advajitages of Upward andDownwa7d Methods of Ventilation. * In a (jovernment report on ventilationlaid before the United States Congress, Clause 3 ofthe report states :— In large rooms an enormousquantity of air must be introduced in the downwardmethod if the occupants are to brenaturalartificia00robe