Product Name: 12W Tilt Solar Panel Square Shroud 12inch Solar Powered Attic Exhaust Fans (SN2013001) Model NO.: SN2013001 Certification: CE Mounting: Roof Fan Electric Current Type: DC Type: Exhaust Fan Blade Material: Aluminum Alloy Material: metal Solar Panel: 12watts/365X365X25mm Air Duct: 12 Inch Ventilation: 520cfm Dimension: 530x530X250mm Trademark: SINOLTECH Transport Package: Color Carton Specification: CE Origin: China Product Description 12W Tilt Solar Panel Square Shroud 12inch Solar Powered Attic Exhaust Fans (SN2013001)20 watt solar panel (365X365X25mm), 12 inch fan blade,Square shroud cover, host size: 530x530X250mmExhaust capacity: 520 CFMFunction Descriptions:Improving air circulation:Taking advantage of the free & clean solar energy, This attic fan will pump out the interior heat & moisture to balance your house temperature, So as to provide a refreshing ventilation and more environmental-friendly surrounding, and to lower down your general power consumption cost.Extending roofing lifespan:Being exposed long to the strong sun, your roofing underlayment may go weak and Even lose efficiency under the very high temperature.This attic fan can help reduce such heat to prolong their lifespan and to help you save certain maintenance or replacement fee.Reducing moisture & harmful mildews:When collided with chilly attic-roof in winter, the interior warm & humid air will condense into water droplets, such saturated humidity might cause dangerous electrical short circuit or create mildews to Harm your plasterboards.An adequate & more active indoor ventilation provided by this attic fan can help remove These moisture contents & harmful elements for you.Preventing ice-dam:In snowy winter, interior warm air could melt those snows at roof to generate droplets falling Down to the eaves.These droplets will then refreeze into ice damming on your roof and arousing dangers, This attic fan can help preventing such unsafe factors through keeping the house dry.Bill of materials: