SOLAR ROYAL Premium Solar Powered Attic Ventilation Fan 55W SR55W-01 includes 1x 30Watt base unit with a extra 25Watt remote monocrystaline panel, up-to 2100CFM ventilation capacity (2650sqft), 12 inch/ 5-blade 'TurboPro' custom nylon/polymeric blade. Brushless 6-24 VDC motor and thermostat. Patent-pending two piece design for easy installation and maintenance, embedded and adjustable angle solar panel brackets included. Automotive grade ABS main body for superior low-profile design, with all aluminum base and stainless steel fasteners. Both solar panels include adjustable angle bracket; embedded on main unit and second remote solar panel for optimal placement.