Ash – The solid residue that remains after combustion is complete
Ash Door – A door below the grade level providing access to the ash receptacle
Baffle – An object placed in an appliance to change the direction of, or to retard, the flow of air or flue gases
Chimney Cap – A protective covering or housing for the top of a chimney intended to prevent the entry of rain, snow, animals, and birds, and to prevent downdrafts
Chimney – A structure containing one or more vertical or nearly vertical passageways for conveying flue gases to the outside atmosphere
Cleanout Opening – An opening or hole in the chimney, usually located near its base, designed to allow access to the flu for purposes of removing ash, creosote, soot and other extraneous matter that becomes trapped
Crown – A sloped covering for the top of a masonry chimney that is designed to shed water away from the flue liner and the chimney and to allow expansion and movement of the flue liner
Flue – The general term for a passage through which gases are conveyed from the combustion chamber to the outer air
Smoke Chamber – The transition area from the damper opening to the beginning of the flue liner in a fireplace system

Level 1 Inspection – A Level 1 inspection shall be utilized when verification of the suitability of the chimney or flue for continued service, under the same conditions and with the same or similar appliance or appliances, is needed
Level 2 Inspection – A Level 2 inspection is indicated when verification of the suitability of the chimney for new or changed condition of service is needed or when a level 1 inspection is not sufficient to determine the serviceability of the chimney
Level 3 Inspection – A Level 3 Inspection shall be required only for those areas suspected of malfunction or damage that cannot be properly evaluated by a Level 1 or Level 2 Inspection