362 



Rural Architecture. 



447. Entrance for Fresh Air. When a stable has been 

 made close and warm, requiring attention to ventilation, 

 provision must be made for air to enter the stable as well 

 as to leave it. This may best be done as represented in 

 Figs. 150-153 and 158-160. 



Fio. 157. Shows method of ventilating an ordinary barn, where the air 

 is taken out of the stable through flues built between the studding 

 and between the joists of the ceiling, the air then rising, through 

 ventilating shafts, made against or as a part of one or more of the 

 purline posts. The air enters at A A and B, following the arrows 

 and passing out along the lines C D E. These ventilators,, if de- 

 sired, can be carried out straight through the roof, or may be ter- 

 minated inside under the purline plate, or as represented in the 

 figure. The cross section at the right shows how 2xl2's and 2x6's 

 may be nailed together and placed so as to constitute a purline 

 post, and at the same time a ventilating flue. The two sides of the 

 purline post or ventilating flue are represented closed with sheets 

 of galvanized iron. They may also be closed with well seasoned 

 matched flooring. The number of bends necessary in this plan is 

 an objection, as they interfere with the draft more or less. 



In all of these cases it will be noted that the fresh air 

 enters at the ceiling. This is for the purpose of mingling 

 it with the warmest air of the stable so as to raise its tern- 



