The Vevor whole-house in-duct air purifier is designed to improve air quality in HVAC systems using photocatalysis and activated carbon technology. Its 18W design and 254 nm wavelength support effective air purification for spaces up to 20-30㎡. The unit features a long-life lamp rated for up to 8,000 hours and includes a power cord for direct connection. A mechanical switch, LED status indicator, and tool-free knob-fastened design make installation and operation simple. It is suitable for homes, offices, schools, and hospitals.