The invention relates to a rotary flow inverter composed of an internal metal conduit (1) constituting part of a chimney and another greater-diameter conduit (2) covering the former. Two ports allow air to pass through the sealed void formed between the two aforementioned conduits while a spiroidal lamella perimetrically conducts the incoming air to the conduit (part of the chimney) by covering thus a far longer path around the hot walls of the conduit (1) of the chimney so that the use of forced air circulation due to elevated heat is thus allowed; this exiting hot huge air quantity transmits really huge heat quantities to the space.
