Ventilation of Farm Buildings. 



301 



the carbon dioxide tends to remain, because it is heavier 

 than the rest of the air in the stable, even although its 

 temperature is higher. 



Via. 156. Represents a method of carrying the flues up the sides and 

 then along und^r the roof between the rafters, so as to reach the 

 ridge either under the cupola, or at other places on either side. 

 Such a flue could be made very tight, by nailing the light galvanized 

 iron on the outside and inside of studding, and rafters, having a 

 sufficient width to give the proper capacity for the ventilating flues, 

 and such a system of ventilation would work fairly well but could 

 not be expected to do as effective service as the methods shown 

 in Pigs. 153, 154, 158 and 159. 



(2) The coldest air is at the floor and the warmest at 

 the ceiling and it is the cold air which should be removed 

 during the winter rather than the warm. 



There should be an opening provided at the ceiling for 

 warm air to escape when the stable is 'too warm and when 

 it is desired to force the ventilation ^at the expense of the 

 heat developed by the animals. 



Both of these openings should bo provided with regu- 

 lating valves so that either or both may be partly or com- 

 pletely closed. 



