Production, sale: -wood briquettes: -non polluting/smokeless fuel -available for all types of solid fuel stoves and boilers, made of pure sawdust without use of any binding agent -fuel efficiency 18-20 MJ/kg, i.e. about 40% more than brown coal/lignite -burning time 180-240 minutes, minimum residual ashes (up to 1%) -complying with DIN ...