AIR AND VENTILATION 



95 



Windoivs. Wall windows commonly serve the dual purpose 

 of lighting and ventilating. In order to get the best results from 

 the driving force, or perflating action of the wind, one window 

 should be placed opposite another so that those on the weather side 

 of the building act as inlets, and those on the lee side as outlets. 



Ordinary sash windows such as are used in human dwellings 

 are seldom seen in animal houses. The most common type, at 

 least in stables, is the Sherringham valve or hopper window. This 

 window is hinged at the bottom and opens downward as shown 

 in figure 31. At the sides are guards to prevent down-draught. 



FIG. 31. A Sherringham Valve or Hopper Window fitted with a quadrant. 



The incoming air is thus directed upwards and spreads out fanwise 

 before falling behind the animals. A great improvement on the 

 existing type would be one that could be reversed when desired so 

 that on very hot, close days, or for sick animals requiring an abund- 

 ance of fresh air, or when the stables are empty during the day, 

 the wind could be directed to fall downwards toward the manger 

 and the floor of the stall. Sherringham valve windows should 

 be under control so that they can be partly closed when necessary. 

 A very good window that has been introduced for byres is one 

 on the Sherringham valve principle that will lift right out of the 

 framework, thus leaving a clear open space on hot days. If wall 

 windows form the only ventilating means in a stable it must be 

 remembered that only those on the weather side will act as inlets, 

 then the minimum ventilating area of each window for each horse 



