There are so many ways to present this info.... and each will be just right for someone. I like the big chart Martin ....want it as a spreadsheet so I can sort on columns to suit my preferences It does kind of show up the need for something in the 2000-3000 range to fill in the lack of quiet choices in the 25-45cfm range

I never pulled a fan apart but I kind of want to with these if you could fit the blade assembly of the GT15 or Delta on the motor of say the san ace 4011... If only it was that easy

I do hope you can test the delta AFB1212HHE and HE