222 



ELEMENTAKY AGKICULTURE 



wall. The outside fresh air comes in through the 

 radiator that warms it. Beside the chimney are 

 air vents leading from points near the floor of the 

 room to the attic. The cold air of the room enters 

 these air vents near the floor and passes to the attic, 

 where openings lead to the outside. The heat of 

 the chimney keeps the air vents warm, causing them 



Fig. 108. 



Courtesy of the Smith Heating Co. 

 A well-ventilated country school. 



to draw the colder air out of the room like another 

 chimney. The hot pipes that extend to radiators 

 on the second floor might be arranged to extend up 

 the other air vents, heating the air and sucking 

 the cold air out of other rooms. Each bedroom 

 should be well ventilated either by an air vent along 

 the chimney or by an open window. Bedrooms 

 ought never to be less than ten by twelve feet, with 

 a ceiling not lower than eight feet. 



School Ventilation. These same principles of 

 ventilation apply to schoolhouses. A^J^here the 



