Davis Instruments Fan Aspirated Radiation Shield Kit Daytime. Half the cost of our 24-hour fan aspirated radiation shield but nearly 75percent as effective in reducing the effects of daytime radiation. Solar-powered fan runs during the day. Since there is no backup battery the fan will cease running when night falls and the effects of radiation are less. Kit includes fan solar panel additional radiation shield plates and hardware. Compatible with Vantage Pro2 and Vantage Pro2 Plus. Specifications for Davis Instruments Daytime Fan Aspirated Radiation Shield Kit: Manufacturer: Davis Instruments Color: Black Package Contents: Davis Instruments Daytime Fan Aspirated Radiation Shield Kit Davis Instruments 7747: Fan Aspirated Radiation Shield Kit Daytime