Sunvent SV-12 Solar Ventilation Fan for Roof, Attic, RV, Boat, Greenhouse Provides continuous ventilation whenever there is sunshine. No batteries, wiring, plugs, or noise. The Sunvent extracts 680 cubic feet of air per hour. Very easy to mount and requires a 4.75" diameter installation hole. Constructed of durable ABS plastic. Dimensions: 8.5" x 8.5" x 3.5"