The rate of ventilation depends on both the wind effect and the stack effect.

The coefficient of effectiveness decreases with the relative size of the larger opening.

In case of concave reflecting interior surfaces ____ are formed where reflected sound waves meet and create a sound of l…

The intensity of sound is proportional to ______ of amplitude.

The maximum rate of air change is ______

In summer, it is necessary to supply _______ air inside the room before it enters the room.

_______________ defect is due to the lack of reflecting surfaces near the source of sound and excessive absorption of so…

In __________ system, the use is made of doors, windows, ventilators and skylights to make the room properly ventilated.