Some areas, under certain conditions of weather and pollution generation, develop health-threatening conditions in the ambient air. A tightly sealed home with controlled amounts of outside air introduced through a designed ventilating system has a wonderful opportunity to protect the occupants from airborne hazards. Both electrostatic cleaners and fiber filters can be easily incorporated into the venting techniques I have mentioned.

For example, the use of a slightly opened kitchen window to allow make-up air for the exhaust fan can be fitted with a frame on a hinge. This frame, that folds out of the way when not in use, could hold any number of filter media available. This inexpensive system could handle many of the common air borne particulates. Cleaners could be installed on an A.A.H.E. or indoor systems might be installed. In any case, the tight home is going to allow less of the harmful outside pollutants in when compared to the ordinary leaky house.