Designed for residential and commercial HVAC systems. Easily installs into the HVAC ductwork. Comes with electrical wiring for hard wiring or connect a plug for outlet connection. Sized for Large Spaces, HVAC Systems, Hospitals, Nursing Homes Assisted Living centers, Commercial Buildings, Residential Buildings, Gyms, Hotels, Planes, Airports, Schools, Construction Sites, Arenas/Stadiums, and Government Buildings. Each device can influence up to 8,000 sq Ft. Multiple units may be used for larger or more difficult environments.