Great work, Martin
I've watched almost all the 38 fan videos. According to your anemometr fans take places from quit to loud:
1 koolance 12038hbk -the most quite
2 ultra kaze 3000
3 san ace h1011
4 delta - the most loud one
Couldn't listen to panaflo m, some server error...
Can you please redo san ace test. It looks like the distance from your anemometr to the fan differs from the other ones in videos. I thought SA H1011 are number one by noise among 38 fans, aren' t they?
P.S. sorry for my english