BARNS FOR WISCONSIN DAIRY FARMS 13 



of the cattle for if they are, all of the foul air will pass di- 

 rectly by the animals and much of it will be breathed in by 

 them. Neither should the outlet flue be placed near the 

 entrance where the opening of the door would break the 

 drawing action of the flue. The outlet flues should be so 

 located as to be out of the way as much as possible and yet 

 be so distributed about the stable as most readily to draw 

 out the foul air. 



Windows may be so arranged as to provide ventilation 

 but in this climate should never take the place of the King 

 system. In case windows are to be used for ventilation they 

 should be hinged at the bottom and open inward from the 

 top. At either side is a galvanized iron shield which prevents 

 air entering at the sides of the window and blowing directly 

 on the cattle. 



FLUES MUST BE PROPERLY CONSTRUCTED 



Much of the success of the King system of ventilation 

 depends upon the construction of the flues. Figure 8 shows 

 detail of construction of an outlet flue. The cost of such a flue 

 will average 75 cents a foot of length. If made of galvanized 

 iron, the flue should be well insulated, otherwise the moisture 

 passing through the flue will be condensed and fall as water. 

 Insulating a round or square galvanized flue is generally im- 

 possible except by a commercial concern. This will increase 

 the cost of installation. 



BUILD FLUE THE RIGHT SIZE 



In this system the total area of the outlet flues should prac- 

 tically equal the area of the inlet flues. If the windows and 

 doors are not tight the number of inlet flues should be re- 

 duced so that their total area should only equal two-thirds 

 of that of the outlet flues as there w : ll be enough air entering 

 the cracks to furnish plenty of fresh air. 



A convenient size of outlet flue is 18x24 inches or 16x22 

 inches. In figuring the size of flue the number of animals 

 should be carefully considered. The following data taken 

 from King's Physics of Agriculture will be found to be of 

 service in computing the size of inlet and outlet flues. 



