HOW DO I MEASURE CASE FANS?

How do you measure case fans?  I see in the catalogs, 40mm, 50mm, 60mm, 80mm.  Is it measured diagonally?  Square? Horizontal?  I guess I need an inch/mm converter, too.
LEECHIPTURNERAsked:
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NewBornVisionCommented:
They are measured diagonally, and i would recommend using 80mm fans to move air thru a tower or mini-tower case. the other sizes are used for small pc's like the shoebox size ones. There are even 120mm fans that are the best for cooling towers ,but some cases have too small an opening for them. hopes this helps.
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danielwpcCommented:
Please notice the screw position in a case will affect what size of fan you can put in. Check your case before you buy the fan. It usually has 4 screw holds as a square which use to position the fan.
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SignsUSCommented:
They are not measured diagonally.  They are measured straight across.


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