I recently purchased a Thermaltake replacement side panel for the Armor/Kandalf case with a large fan mounted thereupon. The box the side panel came in celebrates the 25cm fan, repeatedly. There's even a picture of the fan with a protective cover and a red arrow showing that the diameter is 25cm.
There is a small problem.
The fan is not 25cm. It's 22cm. The portion of the fan and its cover with an arrow showing its 25cm diameter is in fact 22cm in diameter.
If I buy a 5 foot ladder, I expect it to be 5 feet in length. What gives?
Well, the fan has mounting ears. If you measure to the outside of the mounting ears, the fan is 25cm. Similarly, if you measure the diagonal on a 120mm fan, the diagonal is almost 17cm. That doesn't make an ordinary 120mm fan a 17cm fan, IMHO.
I suppose a lawyer would argue otherwise, however. As to how the dimension in the photograph is wrong, I suppose the same lawyer would claim that's a typo. Sigh.
I won't even mention the noise spec printed on the box.