2. No fuel is to be used other than untreated wood with less than 20% moisture content but excluding any such wood which contains halogenated organic compounds or heavy metals as a result of treatment with wood-preservatives or coatings.
2. No fuel is to be used other than untreated wood with less than 20% moisture content but excluding any such wood which contains halogenated organic compounds or heavy metals as a result of treatment with wood-preservatives or coatings.