Fines are caused by pellet disintegration at the mill or in subsequent handling. Two potential problems - dust in the home when the hopper is filled and possible interference to the flow of pellets as the pellets are transported to the burn system. The variance of BTU's per pound is usually not noticeable to most users. Pellet Fuels Institute is participating in tests to determine the effects of salt and the most accurate methods of measurement. The results will be reflected in the sodium portion of the pellet fuel standards.
Clinkers are the result of impurities in the wood before it is pelletized.
Some pellet wood creates a film on the glass to which ash adheres, making a clean glass more difficult. The pellet manufacturer should be able to show test results for BTU's, ash content, and the amount of fines. Do not hesitate to contact the pellet or pellet stove manufacturer if you have questions or concerns.