A fireplace , comprising: a firebox comprising an intake port , an exhaust port , and a window , wherein the window is located between the intake port and the exhaust port ; a translucent shield covering the window ; a flow guide device provided in the firebox , wherein the flow guide device comprises a separator and two stop plates facing each other; the separator divides the firebox into an air chamber below and a combustion chamber above, wherein the air chamber communicates with the intake port , while a front side of the combustion chamber corresponds to the translucent shield , and communicates with the exhaust port ; the separator has a long opening communicating the air chamber and the combustion chamber ; each of the stop plates is long, and is located at the opening , wherein a top edge of each of the stop plates is higher than a top surface of the separator ; the flow guide device further has at least one first air inlet located below the separator , wherein the at least one first air inlet communicates with the opening ; and a combustor adapted to burn gas, wherein the combustor is long, and has a gas outlet provided in a major axial direction thereof; the combustor is located below the separator ; the gas outlet corresponds to a space between the stop plates , characterized in that the flow guide device further has a plurality of first air inlets located below the separator , and each of the plurality of first air inlets is formed between two adjacent first separating plates among a plurality of first separating plates which are separately arranged in a reference axial direction (D), which is parallel to the major axial direction of the combustor and are located on a side of the gas outlet , wherein each of said plurality of first air inlets communicates with the opening . a firebox comprising an intake port , an exhaust port , and a window , wherein the window is located between the intake port and the exhaust port ; a translucent shield covering the window ; a flow guide device provided in the firebox , wherein the flow guide device comprises a separator and two stop plates facing each other; the separator divides the firebox into an air chamber below and a combustion chamber above, wherein the air chamber communicates with the intake port , while a front side of the combustion chamber corresponds to the translucent shield , and communicates with the exhaust port ; the separator has a long opening communicating the air chamber and the combustion chamber ; each of the stop plates is long, and is located at the opening , wherein a top edge of each of the stop plates is higher than a top surface of the separator ; the flow guide device further has at least one first air inlet located below the separator , wherein the at least one first air inlet communicates with the opening ; and a combustor adapted to burn gas, wherein the combustor is long, and has a gas outlet provided in a major axial direction thereof; the combustor is located below the separator ; the gas outlet corresponds to a space between the stop plates , characterized in that the flow guide device further has a plurality of first air inlets located below the separator , and each of the plurality of first air inlets is formed between two adjacent first separating plates among a plurality of first separating plates which are separately arranged in a reference axial direction (D), which is parallel to the major axial direction of the combustor and are located on a side of the gas outlet , wherein each of said plurality of first air inlets communicates with the opening . <EOS>