how about getting a rubbish bag (of a measured volume), or something similar. Seal the opening over the top of the fan - which is mounted on the heatsink. Turn the fan on, and measure the time it takes to suck all the air out.
Not the most accurate way, but if someone tried to do that 5 times in a row and got repeatable results then it might be worth a look into
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2x P3 1100's at 1400, Abit VP6, 2x Corsair 256mb PC150 sticks, 20gb 'cuda ATA-III, 2x 40gb 'cuda ATA-IV in raid 0. 20" Trinitron. No fans
2x 2400+ at 2288mhz (16.0 x 143), Iwill MPX2, 2x Kingmax PC-3200 256mb sticks, 4x 20gb 60gxp in Raid 5 on a Promise SX6000. Asus Ti4200 320/630. Cooled by Water
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