A fireplace, which includes - a firebox for a fuel charge, - an intake air duct for leading intake air to the firebox, - a grate for supporting the fuel charge, wherein the grate includes intake air openings for leading primary air from the intake air duct to the firebox, - a secondary air duct for leading secondary air to the firebox from a second end to a first end of the secondary air duct, and - a secondary air limiter arranged to form a regulating element in the firebox for regulating secondary air that leaves the secondary air duct, characterised in that - said secondary air limiter is arranged to be mobile as a result of the effect of the mass of the fuel charge placed on the grate and arranged to use the regulating element in such a way that when the fuel charge is placed on the grate the secondary air limiter is arranged to open allowing the flow of secondary air to the firebox, and when the mass of the fuel charge placed on the grate is reduced, the secondary air limiter is arranged to close limiting the flow of secondary air to the firebox, - the said intake air duct is a common intake air duct for primary air and secondary air, via which primary air is arranged to flow to the firebox through the grate and via which secondary air is arranged to flow to the firebox beyond the grate, and - the fireplace includes a support joint arranged at the edge included in the secondary air limiter between said grate and secondary air limiter for supporting the grate to the firebox enabling the turning of at least the secondary air limiter around the support joint for moving said regulating element relative to the firebox for automatically regulating the amount of secondary air in each combustion situation according to the combined mass of the fuel charge on the grate and the grate, wherein a secondary air opening is formed between the support joint and the firebox in the second end included in the secondary air duct for leading secondary air from the intake air duct to the secondary air duct. - a firebox for a fuel charge, - an intake air duct for leading intake air to the firebox, - a grate for supporting the fuel charge, wherein the grate includes intake air openings for leading primary air from the intake air duct to the firebox, - a secondary air duct for leading secondary air to the firebox from a second end to a first end of the secondary air duct, and - a secondary air limiter arranged to form a regulating element in the firebox for regulating secondary air that leaves the secondary air duct, characterised in that - said secondary air limiter is arranged to be mobile as a result of the effect of the mass of the fuel charge placed on the grate and arranged to use the regulating element in such a way that when the fuel charge is placed on the grate the secondary air limiter is arranged to open allowing the flow of secondary air to the firebox, and when the mass of the fuel charge placed on the grate is reduced, the secondary air limiter is arranged to close limiting the flow of secondary air to the firebox, - the said intake air duct is a common intake air duct for primary air and secondary air, via which primary air is arranged to flow to the firebox through the grate and via which secondary air is arranged to flow to the firebox beyond the grate, and - the fireplace includes a support joint arranged at the edge included in the secondary air limiter between said grate and secondary air limiter for supporting the grate to the firebox enabling the turning of at least the secondary air limiter around the support joint for moving said regulating element relative to the firebox for automatically regulating the amount of secondary air in each combustion situation according to the combined mass of the fuel charge on the grate and the grate, wherein a secondary air opening is formed between the support joint and the firebox in the second end included in the secondary air duct for leading secondary air from the intake air duct to the secondary air duct.