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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NF-R8 redux-1800 PWM

Product ID: 49541282

Details

Air flow capacity
53.3 Cubic Per
Brand
Noctua
Compatible devices
Desktop
Cooling method
Air
Material
Fibre-glass
Maximum rotational speed
1800 RPM

🌀53.3 m³/h airflow

🔇17.1 dB(A) ultra-quiet

⚙️1800 RPM precision speed

$59.62

Duties & taxes included

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Sold byAmazon EcuadorDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌀 Stay cool, stay ahead—silence and power in perfect harmony.

SMART PWM CONTROL - Dynamic 4-pin PWM adjusts fan speed automatically, balancing performance and silence effortlessly.
COMPACT YET MIGHTY - 80x80x25mm size fits seamlessly into tight spaces while delivering robust cooling.
PROVEN RELIABILITY - Over 150,000 hours MTTF and backed by a 6-year warranty—built to last through every project.
VALUE REDUX EDITION - Noctua’s award-winning quality now at an accessible price, with versatile accessories for custom setups.
WHISPER QUIET POWER - Experience high airflow without the noise—perfect for focused work or gaming marathons.

The Noctua NF-R8 redux-1800 PWM is a premium 80mm cooling fan delivering 53.3 m³/h airflow at a whisper-quiet 17.1 dB(A). Featuring 4-pin PWM for smart speed control up to 1800 RPM, it balances powerful cooling with near-silent operation. Compact and durable with over 150,000 hours MTTF and a 6-year warranty, this fan is ideal for professional-grade PC builds, NAS devices, and chassis ventilation. The redux edition offers Noctua’s renowned quality at a competitive price, supported by a wide range of optional accessories.

Specifications

ASIN	B00KF7MVI2
Air Flow Capacity	53.3 Cubic Metres Per Hour
Best Sellers Rank	9,362 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 33 in Electronic Cooling Fans
Brand	Noctua
Compatible Devices	Desktop
Cooling Method	Air
Country Of Origin	China
Customer Reviews	4.7 4.7 out of 5 stars (4,185)
Global Trade Identification Number	00842431012425, 04716123315339
Included Components	Please see product Description for what is included
Item Dimensions L x W x H	8L x 8W x 2.5H centimetres
Item Type Name	80 mm fan at 1800 rpm
Item Weight	136 g
Manufacturer	Noctua
Manufacturer Part Number	NF-R8 redux-1800 PWM
Material	Fibre-glass reinforced PBT
Max Rotational Speed	1800 RPM
Model Number	NF-R8 redux-1800 PWM
Noise Level	17.1 Decibels
Number of Items	1
Number of Packs	1
Power Connector Type	4-Pin
Product Warranty	6 year manufacturer’s warranty
UPC	804904101210 804067218916 842431012425 801940470928 731215273841 809394586615 808112938552
Unit Count	1.0 count
Voltage	12 Volts

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