Fig. 29. 



Make 



AN EFFICIENT VENTILATING SYSTEM. 



Perspective view of one center vent of barn, showing relation of ventilator to the hay fork, the 

 timbers of the barn, the butter, and the relation of the fresh air intakes to the foul air 

 out-take or ventilator. The outlet chute should be built on the ratio of 5 or 6 cows to the 

 square foot. There should be enough intakes about one-half square foot in area evenly dis- 

 tributed around the outside of the stable to nearly equal the area of the outlet shaft. There 

 should be four square feet of window area per cow. Slide A can be adjusted to regulate the 

 size of the opening in accordance with the temperature of the barn. This system is practical, 

 inexpensive and will work absolutely perfect. 



18 



