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In page Pellet fuel:
"Standards used in the United States are different, developed by the Pellet Fuels Institute and, as in Europe, are not mandatory.[citation needed] Still, many manufacturers comply, as warranties of US-manufactured or imported combustion equipment may not cover damage by pellets non-conformant with regulations.[citation needed] Prices for US pellets surged during the fossil fuel price inflation of 2007–2008, but later dropped markedly and are generally lower on a price per energy amount basis than most fossil fuels, excluding coal.
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