^<5^ JAOaGS X7J£^ 79 



The size outtake for other stock can be arrived at in similar manner. 



The combined area of fresh air inlets must equal the combmed area of the 

 outtake flues. A number of small intakes gives better results than a few large 

 ones. The smaller intakes, proper!}' placed, gi\e more uniform distribution 

 of fresh air and keep the stable temperature more uniform at all points. If 

 intake flues are made too large, they create harmful drafts. The most practical 

 and efficient size for intake flues, in most cases, is from 80 to 100 sc). in. each, 

 cross section area. 



The number of intake flues required can be determined by dividing the 

 combined area of the outtake flues by the size of one intake flue. For example, 

 if the combined area of the outtake flues is 1 1 20 sq. in. and the intakes are 

 made 80 sq. in. each, it will require 1 120-^80 - 14 intakes. 



Registers 



As nearly as conditions permit, the cffectne area of a register or register 

 face should equal the cross section area of the intake with which it is used. 



TABLE 2: 



Cubic Feet of Space per Animal 



It should be distinctly stated that in matters of ventilation it is cubic feet 

 of air rather than cubic feet of space which should be pro\'ided, and in the 

 construction of stables, the amount of space need only be so much as is required 

 to peiTTut ample room and freedom for the animals. 



Thirty cows should not be housed in a space much less than 42 x 33 feet, 

 with ceiling 8 feet in the clear. In warm climates there is no objection, except 

 the matter of cost, to high stables, but when it is cold, high ceilings permit 

 warm air to rise so far above the animals as to leave the stable cold at the floor. 



Essentials of a Ventilating Flue 



A good ventilating flue should have all the characteristics of a good 

 chimney. It should be constructed with air-tight walls, so that no air can enter 

 except from the stable. Its interior surfaces must be smooth, and it should rise 

 above the highest portions of the roof, so as to get the full force of the wind. 

 It is better to have it nearly straight, when possible, and it should have an 

 ample cross section area. In case of a slight angle in the flue, the cross section 

 area should be increased, to offset the friction loss. Stronger currents through 

 the ventilators will be secured by making one or more larger ones than where 

 many small ones are pro\ ided, and it is usually best to have as fe\v as possible. 

 vet not leave the impure air in distant parts of the stable. 



