ecocalm (not tested)12\" solar exhaust fan for greenhouse with battery and adjustable thermostat, attic fans for garage and shed with 2pcs 30w bifacial solar panels thermostat-12in is up for auction in Patio, Lawn & Garden. The current bid is $41.00, 84% below the $260.00 MSRP, in New/Like New condition. This auction has ended — similar items appear in live auctions regularly.