THE DAIRY HERD 97 



the outlet at the ceiling) are shown in Fig. 18. Numer- 

 ous small inlets have the advantage of causing a better 

 distribution of the cold, incoming air than could be se- 

 cured by fewer, but larger openings. 



On the other hand, the outlets should be few and com- 

 paratively large, which will aid in creating draft. 



The fresh air intakes consist of air-tight shafts with 

 cross-sectional areas of about 50 square inches. The 

 shafts are built right in the wall, and open near the 

 floor on the outside and near the ceiling on the inside. 

 It is absolutely necessary to have the outside openings 

 at least several feet below the inside openings, otherwise 

 the warm inside air would rush out instead of the cold, 

 outside air going in. 



The main air outlets may be placed where they are 

 least troublesome. In the barn plans herewith presented, 

 they are placed in the box stalls and communicate with 

 the main barn floor by means of registers in the wall. 



The size of these registers is that of the cross-sectional 

 area of the shafts. 



To secure effective work with the King system of 

 ventilation three things are essential : ( i ) to have the 

 ventilating shafts air-tight; (2) to have the outlet shafts 

 extend to the highest point of the barn; and (3) to have 

 the barn as nearly air-tight as possible. 



Hay Loft. With a perfectly tight ceiling and with 

 the hay chute in the feed room, there is no objection 

 whatever to having a loft above the stable for the stor- 

 age of roughage. Indeed such a loft has two distinct 

 advantages : it helps to keep the stable warm and re- 

 duces the labor in feeding. 



Doors. Two doors should be provided at either end 

 of the barn, as shown in Fig. 18. The outside doors 



