Would this fan work on asus k31bf. fan really noisy and rattling of late. would i need 3 pin or 4pin if it does fit?

Hi, We are not so sure it will fit into your case, assuming it uses the usual 120mm or 140mm fitting, it should be ok. This cooler requires a 4 pin connection. Hope this helps Thanks, Ebuyer Team

What dimension are the fixing hole centres?

Mounting hole spacing: 71,5x71,5 mm

Does this fan have a flow direction arrow on the case?

Yeah, all fans are the same. They all spin counter clockwise and open side is intake.

I have a Dell Optiplex 9010 with a 5 pin fan, can I use a 5 pin to 4 pin adapter with this fan?

Noctua 12V fans comply with the established specifications for standard PC systems issued by Intel and AMD. Systems from Acer, Apple, Dell, HP, Lenovo or other major brands often deviate from these specifications e.g. by using proprietary fan headers, custom pin-alignments or pin-configurations, different methods of fan speed control, etc. This can lead to compatibility issues when using Noctua fans in systems from said brands. Some of these problems can be avoided with some technical knowledge, but especially BIOS related issues (e.g. errors or shutdowns due to low fan speed) can often not be resolved. As a result, Noctua does not officially support systems from Acer, Apple, Dell, HP, Lenovo or other major brands.

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🌬️ Cool down, power up!

SMART CONTROL - Enjoy automatic motherboard speed control for efficient cooling when you need it most.
HIGH PERFORMANCE - Achieve optimal airflow and static pressure with a powerful 1800 RPM fan speed.
PROVEN RELIABILITY - Join hundreds of thousands of satisfied users with a fan that boasts over 100 awards.
VERSATILE COMPATIBILITY - Perfect for chassis ventilation, NAS cooling, and more with a range of optional accessories.
WHISPER QUIET OPERATION - Experience near-silent cooling with a max noise level of just 17.1 dB(A).

The Noctua NF-R8 redux-1800 PWM is a high-performance 80mm cooling fan designed for optimal airflow and quiet operation. With a maximum speed of 1800 RPM and a noise level of just 17.1 dB(A), it ensures efficient cooling for various devices while maintaining a serene environment. This fan is backed by Noctua's renowned quality and reliability, making it a top choice for both enthusiasts and professionals.

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Brand	Noctua
Product Dimensions	8 x 8 x 2.49 cm; 136.08 g
Item model number	NF-R8 redux-1800 PWM
Manufacturer	Noctua
Series	Redux Nf-R8
Colour	grey
Computer Memory Type	DIMM
Voltage	12 Volts
Are Batteries Included	No
Lithium Battery Weight	145 g
Item Weight	136 g
Guaranteed software updates until	unknown

NoctuaNF-R8 redux-1800 PWM, High Performance Cooling Fan, 4-Pin, 1800 RPM (80mm, Grey)

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