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Getting fresh air In the 1970's fuel costs increased dramatically. As a response to this, residential and commercial buildings were built "tighter". This means that the air in the building was not changed as often, if at all. This led to all sorts of problems. To help combat this condition, commercial buildings were required to have a small amount of filtered outside air brought in for each person. Residential buildings did not get this code. As a result, glass cleaner on the bathroom mirror on Tuesday may still be floating around on Friday. The probability of a particle this small being captured and held by a residential air filter is slim. Filtered fresh air has several benefits. By adding filtered air to the building, we are inflating it like a balloon. Any small leaks or a open door will have filtered air moving out not unfiltered air coming in. It helps make a cleaner home. Pollutants generated in the home are diluted. The amount and rate of dilution depends on the volume of filtered fresh air and the run time of the unit. Placing the thermostat fan switch "on" may reduce dilution time. Filtration may improve because of the added fresh air filter. The air being drawn through the filtered fresh air is the reduction that the regular filter will experience. This reduction in volume will give us a lower speed. All residential filters work better at slower speeds.