BUILDINGS 297 
shafts about eight inches square, starting near the floor and 
extending through the roof, and equipped on the top with a 
device for preventing the wind from blowing down the shafts. 
(Fig. 69.) 
Chimney and Pipe.—lf a feed cooker is used, it could be 
utilized to great advantage in assisting ventilation. If the 
SAA 
Fic. 69.—The King system of ventilation as shown for a dairy barn or hog-house. The 
air outlet should start near the floor and extend through the roof. The inlet for air into 
the room is near the ceiling, but should start outside well above the ground. In cold 
weather, windows are for light, not for ventilation, when the King system is in use, 
building is not a very long one, the chimney may be constructed 
at the opposite cud of the building from the feed cooker, and 
the pipe from the feed cooker run the whole length of the 
building before it enters the chimney. In a long building the 
chimney may be placed about the centre, so as not to have too 
great length of stove-pipe. The heat from the stove-pipe has a 
wonderful influence in aiding the cireulation of air in the 
pen, as well as modifying the temperature and helping to 
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