In the recent scenario, because of inavailability of space, people used to build house with a formula called air tight homes. this may be one of the reason for concentrating in the ventilation part. Small kids may be easily affected with this air tight homes. The conccept of infiltration may work on negative results which will disappoint people. Moreover, each and every human has the responsibility about the fresh air in their surroundings which will make them healthy and happy.