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Parging - A thin coat of mortar applied to the inside of a masonry chimney or to the walls of a smoke chamber designed to reduce the resistance of flow in the chimney system.
Pellet Stove - A pellet stove is a stove that burns compressed wood or biomass pellets to create a source of heat for residential and sometimes industrial spaces. By steadily feeding fuel from a storage container (hopper) into a burn pot area, it produces a constant flame that requires little to no physical adjustments.
Pyrolysis - Chemical alteration of wood, coal, or other combustible materials as a result of the application of heat.