2. No fuel is to be used other than untreated wood with less than 20 per cent 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 per cent 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.