Fuel oven, which comprises: - a hollow containment body, which delimits within it a heat treatment chamber in which a product to be treated is susceptible of being arranged; - at least one radiant tube extending inside said heat treatment chamber between an inlet opening thereof, arranged at a first passage of said containment body, and an outlet opening thereof, arranged at a second passage of said containment body; - a housing chamber, thermally insulated from said heat treatment chamber and provided with at least one ventilation opening through which said housing chamber is susceptible of being connected with an external environment; - at least one burner arranged in said housing chamber, intended to burn a combustive mixture for generating combustion gases at high temperatures, and provided with at least one dispensing head fluidically connected with the inlet opening of said radiant tube in order to introduce said combustion gases inside the latter; - suction means arranged in said housing chamber, provided with a suction mouth fluidically connected with the outlet opening of said radiant tube and operable to suction said combustion gases out of said radiant tube; said fuel oven being characterized in that it comprises at least one connection body of tubular shape, positioned in said housing chamber and provided with an inner channel arranged to connect between the outlet opening of said radiant tube and the suction mouth of said suction means, which are adapted to generate an internal reduced pressure in the inner channel of said connection body in order to suction said combusted gases out of said radiant tube; said connection body being provided with at least one insufflation opening through which said inner channel is in communication with said housing chamber; through said insufflation opening, as a result of said internal reduced pressure generated by said suction means in the inner channel of said connection body, a flow of air coming from said housing chamber is susceptible of being suctioned into the inner channel of said connection body, generating an external reduced pressure in said housing chamber which suctions, into said housing chamber, air coming from said external environment through said at least one ventilation opening. - a hollow containment body, which delimits within it a heat treatment chamber in which a product to be treated is susceptible of being arranged; - at least one radiant tube extending inside said heat treatment chamber between an inlet opening thereof, arranged at a first passage of said containment body, and an outlet opening thereof, arranged at a second passage of said containment body; - a housing chamber, thermally insulated from said heat treatment chamber and provided with at least one ventilation opening through which said housing chamber is susceptible of being connected with an external environment; - at least one burner arranged in said housing chamber, intended to burn a combustive mixture for generating combustion gases at high temperatures, and provided with at least one dispensing head fluidically connected with the inlet opening of said radiant tube in order to introduce said combustion gases inside the latter; - suction means arranged in said housing chamber, provided with a suction mouth fluidically connected with the outlet opening of said radiant tube and operable to suction said combustion gases out of said radiant tube;