For proper ventilation of building, windows must be open near the bottom and top of the walls so as to let pass

In cool air near the bottom and hot air out near the roof

For proper ventilation of building, windows must be open near the bott

1.	For proper ventilation of building, windows must be open near the bottom and top of the walls so as to let pass
A.	In more air
B.	In cool air near the bottom and hot air out near the roof
C.	2
D.	Out hot air near the roof
Answer» C. 2

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For proper ventilation of building, windows must be open near the bottom and top of the walls so as to let pass

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