____ provides conditions for the movement or ____ of air, particularly within an ____ space. It involves the ____ of stale, hot, ____ air from an enclosed space and replacing it with a good supply of ____ air. It is important because it improves the ____, comfort and efficiency of people living and ____ within an enclosed space. Ventilation introduces clean or fresh air into a space by either mixing the stale air with the fresh air (____) or by completely removing the stale air and replacing it with fresh air (____). The air movement in ____ depends on ____ and temperature differences between inside and outside. ____ is commonly used because it can be easily ____ to suit the need of the occupants despite the ____ outside the building.




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