P14 rgb version is compatible with asus aura? can i connect them directly to the argb header in my asus board?

Sure can, but be sure to check if you have the 4-pin or 3-pin, if you have only 4-pin headers then the lighting will not be addressable, and you have to be very wary of the connection orientation. Most modern boards have at least 1 5v 3-pin header. Look for the arrow on the connector, align this with the 12v pin on the board, the pinout should be printed adjacent to the header on the board itself.

Would these fans be an acceptable replacement for the stock fans on an arctic liquid freezer ii 420?

It should, as that is the same fan used on their RBG units( check the specs on the Artic web site). I assume your are wanting to add RGB to your Non RGB unit. If U have RGB and fans are defective, U should be able to get free replacement as 6 yr warr.

Does air flow from front label-to-back or back-to-front label? Thanks!

From the logo through the back where the cable and bracing posts are. On all computer fans, the side that is wide open is the intake side. This side usually has the logo and is not constricted by any frame at the center that connects to the outside housing. The side that is attached to the motor is where airflow will come out of. P12’s and P14’s are excellent and inexpensive fans imo. I personally like F14’s for case fans, but I personally have 2 p14’s up top in my case.

ASIN	B09LR6KV3S
Air Flow Capacity	68.9 Cubic Feet Per Minute
Best Sellers Rank	#36,594 in Computers & Accessories ( See Top 100 in Computers & Accessories ) #335 in CPU Fans
Brand	ARCTIC
Brand Name	ARCTIC
Compatible Devices	Desktop
Cooling Method	Fan
Customer Reviews	4.7 out of 5 stars 596 Reviews
Global Trade Identification Number	04895213703505
Importer Contact Information	Allway Distributions Pvt Ltd No. 49, 1st Floor, HB Samaja Rd, Basavanagudi, Bengaluru, Karnataka 560004
Item Type Name	Case Fan
Item Weight	210 Grams
Manufacturer	ARCTIC, ARCTIC HK LTD
Manufacturer Contact Information	ARCTIC HK LTD
Material Type	Polycarbonate
Max Rotational Speed	1900 RPM
Noise Level	0.3 Sones
Packer Contact Information	ARCTIC HK LTD
Power Connector Type	3-Pin
UPC	840033401319
Voltage	12 Volts
Warranty Description	6 Year Manufacturer
Wattage	1.9 Watts

ARCTIC P14 PWM PST A-RGB - Case Fan, 140 mm PWM, Optimised for Static Pressure, Semi-Passive: 0-1900 RPM, 5V 3 Pin A-RGB LED, Single Fan - Black, ACFAN00239A

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