Fan for ovens, which is provided with a rotation axis (X) thereof and is extended along said rotation axis (X) 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 (X) between said front side and said rear side ; said fan comprising: - a support plate which is arranged substantially orthogonal to said rotation axis (X) 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 (X); 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 (X) 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 (X) 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 (X); 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 (X) 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 . <EOS>