A: You may be charged a restocking fee up to 50% of item's price for used or damaged returns and up to 100% for materially different item. 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Powered completely by free solar … UPC 898387002393. #mobile_bottom_sheet,.a-sheet-lightbox,.dp-sheet-noselect{-webkit-tap-highlight-color:transparent;-webkit-touch-callout:none;-webkit-user-select:none;-khtml-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none}#mobile_bottom_sheet{overflow:auto;-webkit-overflow-scrolling:touch;top:0;right:0;bottom:0;left:0;position:inherit}.dp-sheet-lightbox{position:absolute;height:100%;width:100%;opacity:0;z-index:9999;top:0;left:0} #octane-aui-example-id{color:red} What is the minimum and maximum pitch for this to work? While it might move more air than the others, it makes a lot of noise while the older ones are completely silent. Natural Light 24-watt Solar Attic Fan - Gray Color Features: The environmentally sensible solution that can protect your home and save you money! So they won't work in the winter. This fan was easy to install and works great when the sun is shining. 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