Is this a regular box fan

I'm a regular boxing fan. I like MMA too.

Has anyone experienced a clicking motor noise caused by PWM ?

It is because you have it hooked up to a 3 pin source. PWM, 4 pin fans, run at 12 volts all the time. The fourth cable is what controls the speed. 3 pin fans use variable voltage to control RPMs. You need to use a 4 pin source or run it at full speed, 12 volts, or you will always have clicking.

can i used this fan to my corsair h110i that have factory fan

I have 4 of the 120mm fans in my h100i, I cannot imagine why the 140mm fans would not work in the h110i, you just have to use the screws corsair provided you. I will say though that you will be very surprised by just how quite these fans are while providing the same cooling performance as the stock Corsair fans.

Would like to get 2 intake front fans. Would like to know which would be better for airflow these or NF-A14 FLX. Thanks!

They are essentially the same fan the NF-A14 PWM and the NF-A14 FLX. The difference is that the PWM can be controlled by software on your system through your motherboards resources. Most modern motherboards have the 4 pin connector and support. The NF-A14 FLX is controlled by adapters that are included in the kit. There are usually 3 adapters. They controller the air flow on the FLX model. I have used both and I usually prefer the PWM model because I can set thresholds in my system when temps get hot and can cool my system down faster automatically.

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Description

🌀 Elevate your PC’s cool factor with whisper-quiet precision!

PRECISION PWM CONTROL - Seamlessly adjust fan speed from 300 to 1500 RPM via 4-pin PWM for optimal cooling and energy efficiency.
WHISPER QUIET COOLING - Experience near-silent airflow with a max noise level of just 24.6 dB, perfect for focused work or gaming marathons.
VERSATILE COMPATIBILITY - Square 140x140x25mm frame fits perfectly on water cooling radiators, PC cases, and cabinet ventilation setups.
COMPLETE INSTALLATION KIT - Includes anti-vibration mounts, Low-Noise Adaptor, extension and y-cables for effortless, customizable setup.
AWARD WINNING AERODYNAMICS - Flow Acceleration Channels and Acoustic Optimisation frame deliver superior airflow with minimal turbulence.

The Noctua NF-A14 PWM is a premium 140mm fan engineered for ultra-quiet, high-performance cooling. Featuring advanced aerodynamic design and 4-pin PWM speed control, it offers a broad RPM range (300-1500) with minimal noise (24.6 dB max). Its square frame fits seamlessly on radiators and cases, while included accessories ensure easy, vibration-free installation. Built to last with over 150,000 hours MTTF, it’s the go-to choice for professionals demanding silent, efficient airflow.

Specifications

Product Dimensions	5.51"L x 5.51"W x 0.98"H
Brand	Noctua
Power Connector Type	4-Pin
Voltage	12 Volts
Wattage	1.56
Cooling Method	Air
Compatible Devices	Desktop
Noise Level	24.6 dB
Material	Fibre-glass reinforced PBT
Maximum Rotational Speed	1500 RPM
Air Flow Capacity	140.2 CMPH
UPC	897337035856 807320183174 863121543135 846764214280 782386480576 842431014337 841501190025 731215278051
Global Trade Identification Number	00842431014337, 04716123314981, 08510052851694
Manufacturer	Noctua
Number of Items	1
Series	NF-A14 PWM
Item model number	NF-A14 PWM
Item Weight	7 ounces
Item Dimensions LxWxH	8.5 x 1.5 x 6 inches
Color	Brown
Computer Memory Type	DIMM
Batteries	Unknown batteries required.
ASIN	B00CP6QLY6
Is Discontinued By Manufacturer	No
Date First Available	May 8, 2013