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I. What is the reason for a roof fan?
#1
A roof fan fills two needs
 
1. To give a breeze in this manner making the "wind chill factor" 2. To flow the air all through a room or territory
 
II. How do roof fans bring down the temperature?
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They dont, in any event not truly. In contrast to a climate control system, roof fans don't legitimately influence the air temperature. That doesn't mean, in any case, that roof fans are not viable in cooling.
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