wood briquettes (ruf type), made of beech and oak burning inside the wood fuel boiler. alternative fuel, eco fuel,

bio fuel eco alternative ruf type flames solidfuel flame biomass burn boiler solid hardwood briquettes briquetting fire place energy generation renewable oven bioenergy natural sources fireplace sustained wooden resource wood firewood industry stack heat compressed background sawdust dry texture chip power brick block ecology nature briquette heap beech oak burning inside boiler fuel