Quick questoin about an inline fan spec. Tjernlund M-6

So I got this 6" inline fan off Amazon. It's a Tjernlund M-6 model, rated @ 530 CFM. It works great, no complaints, the fucker sucks some air.

I'm just curious about this sticker on the side, it says 424 CMH.. What does that mean? Cubic Meters per Hour?

Also, I just noticed something else that's not right. 1 sticker on the motor says 3000 RPM and on the casing another sticker says 2700 RPM... ehhhhhh not liking that bullshit. Alot of inconsistency in the specs.. but the fan really seems to suck/blow some air.

Oh well, here's some food for thought for those interested in this fan.

Cubic metres per hour? 1 CMH is about the same as 0.6 CFM.

computergroove said:

Cubic metres per hour? 1 CMH is about the same as 0.6 CFM.

Click to expand...

So that would be 250 CFM? But this fan is advertised as 530 CFM.

Something aint right here.