The Dynamic Germicidal UVC Lamp Model 2-DYN-24180-12 is a whole house air purification system that installs directly into the central heating and cooling system ductwork or plenum. The 2-DYN-24180-12 has two 12” lamps. With ultraviolet light, microwatts translate to effectiveness. The 2-DYN-24180-12 with 12” lamp produces a very high output of 150 microwatts which is significantly higher than many other UVC lamps. The high-intensity Dual-Radiant™ UVC “H” Lamp disinfects the air by neutralizing airborne pathogens such as bacteria, viruses, and mold. According to the EPA, the combined use of filtration and germicidal UVC light is an effective means of preventing the distribution of airborne viruses in occupied spaces. One lamp is installed in the return air duct plenum and the other is installed in the supply plenum. The UVC lamps must be replaced every 2 years.