Question 1

How many cfm, or cubic feet per minute?

Accepted Answer

Google says "120,2 cubic meters per hour to cubic feet per minute = 70,747049 (cubic feet) per minute." I can type that in with the best of them.

Question 2

Is this an airflow fan or a static pressure fan?

Accepted Answer

The fan blades are shaped for static pressure. https://www.amazon.com/dp/B00KF7PPY4/ref=psdc_11036291_t1_B07CG2PGY6 are shaped for airflow. These are static optimized fans

Question 3

If I want to only use  two wires on this fan for max speed, which leads should I use green / black ?

Accepted Answer

Here's some info that might help you, and should answer that question giving you some confidence...  that extra pin on a 4 pin fan is the digital speed control -- this is why the fan goes at max speed if plugged into a 3 pin connector (letting the 4th pin just hang over the side), rather than a a 4 pin connector.  Pin number 3 is what tells your motherboard the rotations per minute (RPM) of the fan.  So, all that you are left with is the first two pins.  The first pin is ground (almost always black) and the second pin is the power (it's 12 volts, but you can get 5 volts from the a custom connector from the power supply instead of the 4 pin motherboard connector if you want to have a slower fan).  Here's a chart:

For 4-Wire Pulse Width Modulation (PWM) Controlled Fans

Pin 	Name 	Description	Wire color(usual)
1	GND 	Ground            black
2	+12V	Fan Power	yellow
3	SIGNAL	Fan RPM	        green
4	PWM	Digital Control	blue

So to answer your question, yes it is possible to just use the first two pins (regardless of color, although the first one is almost always black, but the color of the second one is not always the same).

Question 4

Will the pwm control on this fan stop it completely even with power to +12v/gnd?

Accepted Answer

On my motherboard (ASUS X99-E WS), can't speak for any other motherboards, any percentage below 50% results in no movement, giving you only really adjustment between 50-100%. I found this somewhat frustrating, but I do prefer this to them never coming to a complete stop.

ASIN	B07CG2PGY6
Air Flow Capacity	120.2 Cubic Metres Per Hour
Best Sellers Rank	1,727 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 6 in Thermal Management Products
Brand	Noctua
Compatible Devices	Desktop
Cooling Method	Air
Country Of Origin	China
Customer Reviews	4.8 4.8 out of 5 stars (19,248)
Global Trade Identification Number	09010018100365
Included Components	1 UK
Item Dimensions L x W x H	12L x 12W x 2.5H centimetres
Item Type Name	4-pin PWM fan
Item Weight	0.13 Kilograms
Manufacturer	Noctua
Manufacturer Part Number	NF-P12 redux-1700 PWM
Material	Fibre-glass reinforced PBT
Max Rotational Speed	1700 RPM
Model Number	NF-P12 redux 1700 PWM
Noise Level	25.1 Decibels
Number of Items	1
Power Connector Type	4-Pin
Product Warranty	6 year manufacturer’s warranty
UPC	841501110368
Unit Count	1.0 count
Voltage	12 Volts
Wattage	1.08 watts

NF-P12 redux-1700 PWM, High Performance Cooling Fan, 4-Pin, 1700 RPM (120mm, Grey)

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