AHU Series 1 is the original Fresh-Aire UV germicidal UV light product. It is similar in function to Blue-Tube UV but features a remote mounted, water resistant, NEMA rated power supply which can power up to 4 UV-C lamps. AHU Series 1 disinfects cooling coils and air system interior surfaces while improving indoor air quality. TUV-100D-I comes with two 1 year lamps and a 110-277 VAC heavy-duty power supply.e Fresh-Aire UV Air Handler Unit Series 1 germicidal UV light system is installed in the central air system where it suppresses mold growth on the cooling coils and surrounding areas while improving indoor air quality throughout the home.