The correction factor to go from 3” to 28” is .327.
93 / .327 = 284cfm.
Which is also the result I got when I tried the Wallace calculator.[/QUOTEI apologize, I posted a larger number but double checked the chart and realized it was 863
I apologize, I had misread the chart the first time as 93 when I had started and caught it before replying. I had changed the final flow but missed changing the initial 3.0 inch flow. Correction made on first reply, thank you!