Abstract: Portable turner for combustion of a gaseous fuel comprising an elongated combustion chamber (1), the front end of which is open and the back end of which is closed with a back (2) and that is connected partly with a fuel gas conduit (4) and partly with a combustion air conduit (5.1), and that is enclosed by a concentric cooling jacket (1.2) for the flow of a cooling medium. The cooling jacket (12) shows an exhaust opening at the open front end of the combustion chamber (1) and is connected with a cooling air conduit (5.2) for the delivery of cooling air, that in its turn is connected with a compressed air source. The compressed air source may consist of a cooling blower (10) that is connected with an air motor (9) via a shaft (10.1) and that is fed with compressed air from a compressed air conduit (5).