Ventilatioji of Farm Buildings. 



355 



hour, using the data in the table of (437) , would be as 

 stated below: 



For horses 4,296 cu. ft. per hour per head. 



For cows 3,54'2 cu. ft. per hour per head. 



For swine . 1,M92 eu. ft per hour per head. 



For sheep 917 cu. ft. per hour per head. 



For hens 31.4 cu. ft. per hour per head. 



Fio. 150. Simplest method of taking air into stone or basement stable. 

 A B and A B show where the air enters. These flues may be made 

 out of ordinary 5 or 6 inch stove pipe with elbow, or galvanized iron 

 conductor pipe, or the pipe through wall may be ordinary 5 inch 

 drain tile, with stove pipe and elbow on inside, or the flue may be 

 made of 6 inch fencing. 



The weights here assumed are 1,000 Ibs. for the horse 

 and cow, 150 Ibs. for the hog, 100 Ibs. for sheep and 3 Ibs. 

 for the hen. With different weights the amounts would 

 change somewhat in proportion to the size of the animals. 



441. Capacity of Ventilating Flues. With the data in the 

 last section, and the number of animals to be provided with 

 air, the capacity of ventilating flues should be such as to 

 ensure an air movement equal the rate given in the tablo 

 of (440). It is practicable to construct ventilating flues 

 through which the air from stables will travel at the rate 

 of 200 to 500 feet per minute without mechanical forcing 

 or the aid of heat, other than that derived from the ani- 

 mals in the stable. 



With a ventilating flue 2x2 feet inside measure 20 cows 

 would bo supplied when the current in the flue was at the 

 rate of 295 feet per minute. At this rate 40 cows would 



