SunonMF40202V2-1000U-A99 MF Series 40 x 40 x 20 mm 24 V 6000 RPM 7.7 CFM Vapo DC Fan - 2 item(s)

So upgrading the fans on the ender 3's are nothing new. however if you get a quieter fan you will be required to use a buck converter to reduce the voltage going to the fan to 12v. With these Sunon fans you dont need the buck converter as they are 24v. I would say the fan sound is really close to stock with these and they do produce a huge increase in airflow using a different style fan duct. I used the BRISS fang duct with two of these and i had to increase the bed temp from to keep the part from curling due to the increase in air flow. I have not done a overhang test yet but i do believe this will allow the printer to print 90deg without a support.

It's a great fan, it does fan things. But, Sunon fans with their autorestart feature ("A" at the end of the model number) don't play nice with the PWM controls on most mainboards. If you're going to have this running at 100%, then you're fine. If you want to be able to adjust the speed for, say, part cooling, then either you're clever enough to figure it out (TELL ME HOW) or you're better off getting one without autorestart.

Will this work on my cr-10s phone to v2 rear exhaust fan????

I purchased this fan to replace the one on my 3d printer with more airflow. They are very quiet, I dont know about the airflow rating. My only concern is they dont come with a grill to block little fingers. I cut my finger open when I accidentally jammed it into the front.