Whats the cfm of this fan?

The output, converted from 9.4 m3/h is just 5.5 cfm, very low indeed.

What is the mtbf. How many hours of life can I expect from one of these?

Not sure about the Mtbf, but i purchased 2 of this in Jan 2020, and they have been running 24/7 till now with no problems. Installed them in my 2 poe+ switches

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Noctua NF-A4x20 FLX Computer Case Fan - Cooling Components (Computer Case, Fan, 4 cm, 3700 RPM, 5000 RPM, 4400 RPM)

Noctua NF-A4x20 FLX Computer Case Fan - Cooling Components (Computer Case, Fan, 4 cm, 3700 RPM, 5000 RPM, 4400 RPM)

Product ID: 47568525

Details

Air Flow Capacity
9.4 Cubic Per
Brand
Noctua
Compatible Devices
Desktop
Cooling Method
Air
Material
Fibre-glass
Maximum Rotational Speed
5000 RPM

🌀Up to 5000 RPM speed control

🔇Ultra-quiet max 14.9 dB(A) noise

🛠️Includes anti-vibration mounts & adaptors

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10.43 OMR

Duties & taxes included

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Description

🌀 Silence meets power: The fan your setup deserves

COMPACT POWERHOUSE - 40x40x20mm size ideal for tight 1U spaces & network gear
TAILORED SPEED CONTROL - 3-step FLX settings for perfect balance of airflow & quiet
PLUG PLAY VERSATILITY - OmniJoin adaptor set & extension cable for seamless installation
VIBRATION FREE OPERATION - Integrated silicone anti-vibration pads for whisper-quiet stability
PRECISION AIRFLOW MASTERY - Flow Acceleration Channels boost efficiency & silence

The Noctua NF-A4x20 FLX is a premium 40x40x20mm computer case fan engineered for ultra-quiet, high-performance cooling. Featuring advanced Flow Acceleration Channels and a second-generation SSO2 bearing, it delivers up to 5000 RPM with minimal noise (max 14.9 dB(A)). Designed for compact 1U applications and network/storage devices, it includes anti-vibration mounts, multiple speed adaptors, and versatile connectors for effortless installation and tailored airflow control.

Specifications

ASIN	B072JK9GX6
Air Flow Capacity	9.4 Cubic Meters Per Hour
Best Sellers Rank	#89 in Computer Case Fans
Brand Name	Noctua
Compatible Devices	Desktop
Cooling Method	Air
Customer Reviews	4.8 4.8 out of 5 stars (2,509)
Included Components	1
Item Dimensions L x W x H	1.57"L x 1.57"W x 0.79"H
Manufacturer	Noctua
Material Type	Fibre-glass reinforced PBT
Maximum Rotational Speed	5000 RPM
Model	NF-A4x20 FLX
Noise Level	14.9 Decibels
Part Number	NF-A4x20 FLX
Power Connector Type	3-Pin
UPC	841500110116
Unit Count	1.0 Count
Voltage	12 Volts
Warranty Description	6 year manufacturer’s warranty

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