Whoot great job martin.
I noticed the ap-121 was much higher on rpm to push the same amount of air as the rest. that inbuilt grill straightens but cuts flow I guess.-Fan is hard mounted to an XSPC RS120 radiator with anemometer measuring CFM output, fan in push. CFM number is not calibrated and only good for relative comparisons
Strange thing is I found the GT at 40 cfm easier on the ears then 20-30 it had a whine in these tests i don't have that in RL.





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