Modern homes are tightly sealed for energy efficiency, but it can also cause the air inside to become stagnant, leading to a buildup of pollutants such as carbon dioxide, volatile organic compounds (VOCs), and other harmful particles.  A fresh air fan supplies air from outside to the inside of a home and plays a crucial role in maintaining good indoor air quality by circulating fresh air into the building, diluting the concentration of pollutants.

QuFresh fans with controls allow for users to limit the incoming air to only fit certain temperature and humidity standards, automatically shutting off when the outdoor conditions do not meet the quality standards desired. 

QuFresh Fresh Air Fans come with easy wiring access for 120V / 60Hz. Being an independent system, it will need to be connected to a home's power, but does not usually require a dedicated circuit. 

No; It is not a requirement in many states or codes, but it is recommended to install a filter when the system allows it (such as with the QuFresh Fresh Air Fans) for optimal air quality.  Depending on the outdoor conditions, your filter may need more frequent changing, but usually it's recommended to change your fresh air supply fan filter at the same time you change your HVAC unit's filter.