QuFresh 50/80 CFM MQF Wall/Ceiling Mount Fresh Air Supply Fan with Temperature and Humidity ControlsThe QuFresh MQF Fresh Air Fan offers home builders, contractors, and developers a low cost, compact and effective mechanical fresh air solution for introducing constant fresh air from outside into a home, meeting fresh air CFM requirements, "Code Compliant" ventilation standards, or "Energy Preferred" ventilation by limiting the intake of outdoor air that is too humid, too hot, too cold, or too dry. This fan is constructed with a durable galvanized