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.

Nf A4x20 5v Pwm Premium Quiet Fan 4 Pin 5v

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Description

🌀 Silent strength in a compact frame—cool smarter, not louder.

BUILT TO LAST - Crafted from fibre-glass reinforced PBT with an impressive >150,000 hours MTTF and backed by a 6-year warranty, ensuring long-term reliability and peace of mind.
COMPACT YET MIGHTY - Sized at 40x40x20mm, this fan fits seamlessly into tight spaces like NVIDIA Jetson Nano, NAS, and DVRs without compromising performance.
WHISPER QUIET POWER - Experience premium cooling with noise levels as low as 14.9 dB(A), perfect for focused workspaces and serene environments.
AWARD WINNING DESIGN - Featuring Flow Acceleration Channels and Advanced Acoustic Optimisation for superior airflow and minimal turbulence—engineered for pros who demand excellence.
PRECISION PWM CONTROL - 4-pin PWM interface ensures dynamic speed adjustment for optimal airflow and energy efficiency tailored to your device’s needs.

The Noctua NF-A4x20 5V PWM is a premium 40x40x20mm quiet fan designed for specialized applications like NVIDIA Jetson Nano, NAS, and DVRs. It delivers up to 5000 RPM with ultra-low noise at 14.9 dB(A), leveraging award-winning aerodynamic design for efficient airflow. Built with durable fibre-glass reinforced PBT, it offers exceptional reliability with over 150,000 hours MTTF and a 6-year warranty, making it the go-to choice for professionals seeking silent, long-lasting cooling solutions.

Specifications

ASIN	B071FNHVXN
Best Sellers Rank	#16,619 in Computers ( See Top 100 in Computers ) #103 in Computer Case Fans
Brand Name	Noctua
Compatible Devices	3d printer, NAS, DVR
Cooling Method	Air
Customer Reviews	4.8 4.8 out of 5 stars (884)
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
Model	NF-A4x205VPWM
Noise Level	14.9 Decibels
Number of Items	1
Part Number	NF-A4x20 5V PWM
Power Connector Type	4-Pin
Unit Count	1 Count
Voltage	5 Volts
Warranty Description	6 year manufacturer’s warranty

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€ 52.27

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In stock

Sold byAmazon AustriaDelivered 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 Austria.

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