BARNS FOR WISCONSIN DAIRY FARMS 



11 



air flowing outward. It is very important that the inlet flue 

 be covered with fine wire screening to prevent the flue from 

 becoming obstructed. The valve or register should be 

 arranged to open and close so as to prevent drafts in the 

 barn and to keep the stable from becoming too cold during 



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FIG. 6. INLET FLUE IN STONE WALL 



Vitrified sewer tile or galvanized iron pipe may be used to provide the air passage 

 in masonry wall. 



the extreme winter season. A register, similar to those used 

 for hot-air furnaces, may be installed in place of the damper. 

 The foul air flues are made of galvanized iron, insulated, 

 or of paper and lumber. The design of these flues is of the 

 greatest importance to the success of the ventilating system. 

 They should be as straight and smooth as possible for every 

 turn or bend reduces the carrying capacity of the flue. If it 

 is necessary to pass around a bend, the flue should be en- 



