First time I've heard of that, this video seems to back it up:
https://www.youtube.com/watch?v=1L2ef1CP-yw
Depending on the fan 50cm or more from the window is about right for max flow
First time I've heard of that, this video seems to back it up:
https://www.youtube.com/watch?v=1L2ef1CP-yw
Depending on the fan 50cm or more from the window is about right for max flow