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In page Pellet fuel:
"Pellets conforming to the European standards norms which contain recycled wood or outside contaminants are considered Class B pellets.[1] Recycled materials such as particle board, treated or painted wood, melamine resin-coated panels and the like are particularly unsuitable for use in pellets, since they may produce noxious emissions and uncontrolled variations in the burning characteristics of the pellets.[citation needed]
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