Fresh Air system uses air flow it means outside air is brought in through the cooler, where it is cooled and pushed through the building, then exhausted to the outside through screened windows or doors. This type of air circulation differs from traditional air conditioning, because fresh air systems are designed to supply an entire exchange of all the buildings air every 2 to 3 minutes. Fresh air systems are the centrepiece of today?s tightly constructed, energy-efficient homes, providing a continuous supply of fresh air to improve indoor air quality and overall home comfort.