Dryer vent for exhaust

I did a quick ball-park CFM test on my extraction setup today. I used a duct anemometer to measure ft/min at the intake of the fan (6" AC Infinity 6S) with filter disconnected. The fan output goes into 16" of straight 6" flex to a 6"x4" adaptor, then into the 4" dryer vent. I expect the net cfm will be lower when I install it later during stink production. CFM = FPM * 0.2 sqf (approx using 6" dia round duct)
Speed -- FPM -- CFM
1 -------- 290 ---58
2 -------- 463 --- 93
3 -------- 624 --- 125
4 -------- 773 --- 155
5 -------- 933 --- 187
6 ------ 1066 --- 213
7 ------ 1249 --- 250
8 ------ 1449 --- 290

Grow space is about 12 sqf, 96 cuf. I will run on 2-3, 5 and above is noisy, 7-8 are ridiculously loud.

Decent numbers for being reduced to 4”
 
Yeah, I can't complain. 1st grow went well, no smell inside or out. I've added a dehumi to the lung room since then, and trying to get some old rare beans going for this run.
 
Just make sure your fan exhausting out the dryer vent is stronger than the fan in the dryer or its going to back feed into your grow.
 
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