40 



The Essentials of Poultry Raising 



in the back of the house and keep it open in the summer time 

 and closed in the winter. 



90. Ventilation by Draft. Fig. 18 shows a cross section of a 

 house built for a cold climate. It is provided with a ventilator 

 at the back and an open front. The air passes in one opening 

 and through the house and out of the opposite opening. The 

 front opening is provided with a drop curtain, which consists 

 ot a wood frame covered with muslin. In the summer time 

 this curtain is kept up, as shown in the picture, and in the 

 winter time it is closed down. The fronts of such houses are 



Fig. 18. Diagram showing currents of air through a poultry house. 

 The air enters at a, passes under the droppings boards at b and g, but no 

 draft strikes the birds on the roost at /. The air passes through the 

 house, as indicated by the arrows, and out at c. For cold climates it is 

 desirable to have a front drop curtain immediately in front of the birds 

 and at the front of the house, as indicated in the drawing. The curtain 

 material must allow of the passage of air through it. (From Poultry 

 Culture, Sanitation and Hygiene.) 



also furnished with one or more windows to provide light when 

 the drop curtain is down. It will also be noted that the house 

 is sealed as far up as the front of the dropping boards. A cur- 

 tain is provided at the front of the droppings boards which, as 



