Fan for ovens, which is provided with a rotation axis thereof and is extended along said rotation axis between a front side and a rear side directed in opposite directions with respect to each other, and is provided with a peripheral side which is extended around said rotation axis between said front side and said rear side; said fan comprising: - a support plate which is arranged substantially orthogonal to said rotation axis and is provided with a first face, which delimits the rear side of said fan, and with a second face directed towards the front side of said fan; - multiple blades projectingly fixed on the second face of said support plate and arranged around said rotation axis; each said blade being provided with: - a rear edge fixed to the second face of said support plate; - an external edge arranged on the peripheral side of said fan; - an internal edge placed to connect between said rear edge and said external edge and facing the front side of said fan; - a ring which is fixed to said blades, is extended around the rotation axis of said fan, is provided with a third face directed towards the rear side of said fan and with a fourth face directed towards the front side of said fan; and is positioned in a position substantially intermediate between the internal edge of said blades and said support plate; said fan being characterized in that the external edge of each said blade is provided with a recess which is open on the peripheral side and on the rear side of said fan and in such recess said ring is fixed; wherein the recesses of said blades define a non-interference zone which is extended between the rear side of said fan and the third face of said ring. - a support plate which is arranged substantially orthogonal to said rotation axis and is provided with a first face, which delimits the rear side of said fan, and with a second face directed towards the front side of said fan; - multiple blades projectingly fixed on the second face of said support plate and arranged around said rotation axis; each said blade being provided with: - a rear edge fixed to the second face of said support plate; - an external edge arranged on the peripheral side of said fan; - an internal edge placed to connect between said rear edge and said external edge and facing the front side of said fan; - a rear edge fixed to the second face of said support plate; - an external edge arranged on the peripheral side of said fan; - an internal edge placed to connect between said rear edge and said external edge and facing the front side of said fan; - a ring which is fixed to said blades, is extended around the rotation axis of said fan, is provided with a third face directed towards the rear side of said fan and with a fourth face directed towards the front side of said fan; and is positioned in a position substantially intermediate between the internal edge of said blades and said support plate; said fan being characterized in that the external edge of each said blade is provided with a recess which is open on the peripheral side and on the rear side of said fan and in such recess said ring is fixed; wherein the recesses of said blades define a non-interference zone which is extended between the rear side of said fan and the third face of said ring.