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This document is applicable to inset appliances including open fires for solid fuel (hand fed solid fuel fired inset appliances, with or without functional modification, that operate without fire doors or operate with fire doors either as closed only or as closed or open, and also includes open fires fired by solid fuel). The intended use of the appliances is space heating in residential buildings. They can be fitted with a boiler (integral part of the appliance containing water to be heated up) for the supply of hot water for central heating systems. The surround of these appliances is integrated with the building with the exception of free-standing appliances and those inset appliances which are installed into a fireplace recess or enclosure. These appliances can burn one or more types of the following solid fuels as specified: - wood logs; - compressed untreated wood; - wood pellets; - lignite briquettes; - solid mineral fuels; - peat briquettes. This document is also applicable to Kachelofen/Putzofen inset appliances, having nominal heat outputs up to 15 kW. This document is not applicable to appliances with fan assisted combustion air or appliances that are mechanically fed. Open fireplace components such as a bottomgrate with associated fire front which are intended for installation into an existing heat resistant, insulated firebox are not covered by this document. This document specifies procedures for assessment and verification of constancy of performance (AVCP) of characteristics of solid fuel burning inset appliances including open fires.