^<5^ j^(?ae:s i>ja.v 57 



barn. That's the WRONG IDEA that is costing dairymen of America 

 thousands of dollars m decreased milk production, losses from disease, in 

 depreciation of barns, equipment, hay, feed and in spontaneous combustion 

 fires. 



A cold barn does not mean a well-ventilated barn either. Foul, moisture- 

 saturated air gets just as cold as pure air. 



THE VENTILATORS THEMSELVES ARE ONLY PART 

 OF THE VENTILATING SYSTEMS. 



Your barn is not ventilated unless it is supplied with the right amount of 

 pure air per animal — unless the entire volume of air in the entire barn is 

 renewed constantly. 



— and it IS not rightly ventilated unless the warmth is kept in the barn, 

 while the foul air and excessive moisture, floating dust and germs are expelled 

 — unless every part of the barn from basement to haymow is kept free from 

 foul air, gases and damaging moisture. 



Your barn is not rightly ventilated unless this complete ventilation is 

 accomplished without strong drafts and air currents, which not only fail to 

 give complete ventilation, but keep harmful dust afloat in the barn. All the 

 air must be completely changed, not merely stirred up. 



No Sir — just cupolas, or ventilators by themselves, will never give real 

 ventilation. There's got to be a s])stem behind the ventilator. 



The health laws of every state demand a certain number of cubic feet 

 of fresh air per person in schools, churches, theaters, etc. — and it takes expert 

 engineers to provide it. It is no easy, simple task — it is no easier with barns. 

 It takes the same expert engineering. 



Yet while the ventilators are only part of a system — the EFFICIENCY 

 of the WHOLE system depends on them. 



Cupolas and ventilators without a properly designed system are of no 

 ventilating worth. You can't just buy a ventilator and supply your need. 

 That's a big point to remember. 



Yet, with the properly designed system, you still must take great pains 

 in selecting the right ventilator. If your ventilator doesn't release the proper 

 volume of air, your system doesn't work. It's the old case of no chain being 

 stronger than its weakest link. 



Correct barn ventilation is only possible when you have both a correctly 

 designed ventilating system, and a correctly designed ventilator. Hie lack 

 of either one will prevent proper barn ventilation. 



Now let's study this matter of ventilation carefully and get a thorough 

 understanding of it. 



Ventilation is the process of creating and regulating diffused air currents, 

 removing foul air and introducing sufficient pure air into a building, so that a 

 certain standard of purity healthful to man and beast is at all times maintained. 



