Toroidal Venta Propeller

thingiverse

A toroidal propeller for Venta models LW44 and LW45. Might work on other models. I did try it on an LW25, it fits but it was not as quiet as on the other two airwashers, due to the way the LW25 was designed. On the LW44 and LW45, the toroidal propeller produces significantly less noise than the original Venta propeller. Air throughput for both propellers is approximately the same. Using a good microphone, I measured the produced noise by both propellers, see the chart. Keep in mind that a 6 dB difference is actually a factor two. I printed mine in PETG at 0.2mm, no supports needed.