Papst 4412 FGL : 26.0 dBA @ 55.3 CFM
NMB Tech DC4710NM-04W-B10-P00: 27.0 dBA @ 59 CFM
Papst 4212 NGM (38mm thick): 28.0 dBA @ 58.9 CFM
Those are the best fans, at full speed. When running at 10V or 7V figures change.
The dye will not replace WW. If you're unsure about a chemical reaction make a 'test tube' and fill it with a mix of water, WW, and dye and wait a few days to see what happens...
I think other ppl already mixed those without any problem.
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