CHAPTER V 

 HOW TO GET FRESH AIR. DRAFTS 



Some people think that we do not need to trouble our- 

 selves about ventilating a room when it is large. They 

 believe that there is air enough in it to last a long time. 

 But this is a mistake. To be sure, the air lasts a little 

 longer in a large room than in a small one ; still after an 

 hour or so the people in it need to have just as much 

 pure air come in and impure air go out as if they were 

 in a small room. 



Whenever you go into a house from out of doors 

 take special pains to notice how the air smells. Notice 

 it when you first go in, because each one of us gets used 

 to air after we have been in it awhile, and then we can- 

 not tell whether it is pure or impure. If it really has any 

 odor, or if it does not seem pleasant as compared to the 

 air out of doors, you may know that it is not pure. 



Do not make a mistake and think that air is impure 

 when it is only warm, for warm air may be pure air too. 

 Sometimes you will have to go by the odor that you 

 find when the room " smells close," as we say. 



Yet, after all, the great and useful thing for us to know 

 is just what to do to get pure air in and impure air out 

 of our homes. 



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