Can these be wired to a usb connector and run off a usb wall charger?

Yes. I run mine off of the gpio pins on a raspberry pi. That's the same concept.

Does this noctua nf-a4x20 5v pwm premium-quality quiet 40mm fan come with the mounting screws?

Yes, it comes with screws a couple of different connectors for attaching it to 3 and 4 pin connections also some rubbery plug things to pull through the mount holes.

Can a 3.3v PWM signal be used to control fan speed?

Yes, a 3.3V logic (PWM) signal will control this fan. I use an Arduino DUE board to control this fan. The DUE puts out 3.3V logic signals.

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NF-A4x20 5V PWM, Premium Quiet Fan, 4-Pin, 5V Version (40x20mm, Brown)

Product ID: 258574069

Details

Brand
Noctua
Cooling method
Air
Power connector type
4-Pin
Product dimensions
20L x 40W x
Voltage
5 Volts

⚡5V 4-pin PWM power control

🌀5000 RPM max speed

🔇Ultra-quiet 14.9 dB(A)

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$57.84

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Description

🛠️ Silent power in a compact frame—cool smarter, not louder.

BUILT TO LAST - Over 150,000 hours MTTF means this fan keeps your gear cool and running longer—backed by a 6-year manufacturer’s warranty.
COMPACT POWERHOUSE - Ultra-compact 40x40x20mm size fits perfectly in tight spaces like NVIDIA Jetson Nano, network switches, and NAS units.
AWARD WINNING DESIGN - Flow Acceleration Channels and Advanced Acoustic Optimisation frame deliver superior airflow with minimal noise—trusted by pros worldwide.
PRECISION PWM CONTROL - 4-pin PWM ensures dynamic speed adjustment for optimal cooling and energy efficiency tailored to your device’s needs.
WHISPER QUIET COOLING - Experience near-silent airflow with industry-leading 14.9 dB(A) noise levels—because your workspace deserves peace.

The Noctua NF-A4x20 5V PWM is a premium, ultra-quiet 40x40x20mm cooling fan designed for compact devices like NVIDIA Jetson Nano and network equipment. Featuring a 4-pin PWM connector for precise speed control, it spins up to 5000 RPM while maintaining a whisper-quiet 14.9 dB(A) noise level. Engineered with award-winning aerodynamic design and built to last over 150,000 hours, it ensures reliable, efficient cooling backed by a 6-year warranty.

Specifications

ASIN	B071FNHVXN
Best Sellers Rank	#15,945 in Computers ( See Top 100 in Computers ) #87 in Computer Case Fans
Brand	Noctua
Brand Name	Noctua
Compatible Devices	Desktop
Compatible devices	Desktop
Cooling Method	Air
Cooling method	Air
Customer Reviews	4.8 out of 5 stars 4,861 Reviews
Global Trade Identification Number	09010018100136
Item Dimensions L x W x H	20L x 40W x 40H millimeters
Item Weight	84 Grams
Manufacturer	Noctua
Material Type	Fibre-glass reinforced PBT
Maximum Rotational Speed	5000 RPM
Noise Level	14.9 Decibels
Power Connector Type	4-Pin
Power connector type	4-Pin
Product dimensions	20L x 40W x 40H millimeters
Unit Count	1 Count
Voltage	5 Volts
Warranty Description	6 year manufacturer’s warranty

Reviews

R**X

Amazing silent fan

I order two silent fans and replace a very loud original fans for network switch. Amazing performance no sound at all.

12.11.2022

M**I

Excellent product

This items working perfectly more than original FANs which coming on QNAP 10g managed switch. Very quiet and cooling the switch. Highly Recommended for others

20.10.2022

J**I

Very quiet

Bought this to replace my noisy 3D printer hotend fan. It is quiet now.

23.04.2022

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$57.84

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In stock

Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to USA.

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