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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🌀 Silent cooling that keeps your gear—and your focus—on point.

BUILT TO LAST - Over 150,000 hours MTTF guarantees long-term reliability for your critical network and storage devices.
COMPACT YET MIGHTY - Sized at 40x40x20mm, this fan fits seamlessly into tight setups like NVIDIA Jetson Nano and 1U servers.
WHISPER QUIET POWER - Experience premium cooling with noise levels as low as 14.9 dB(A), perfect for focused workspaces.
PRECISION PWM CONTROL - 4-pin PWM interface ensures dynamic speed adjustment for optimal airflow and energy efficiency.
ALL INCLUSIVE INSTALLATION KIT - Comes with anti-vibration mounts, screws, extension cable, and OmniJoin adaptor for effortless setup.

The Noctua NF-A4x20 5V PWM is a premium 40x40x20mm quiet fan designed for 5V applications, delivering up to 5000 RPM with ultra-low noise of 14.9 dB(A). Featuring advanced acoustic optimization and Flow Acceleration Channels, it ensures efficient airflow in compact devices like NVIDIA Jetson Nano, network equipment, and storage systems. With a robust lifespan exceeding 150,000 hours and a comprehensive mounting kit, it’s engineered for professional-grade reliability and silent performance.

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Product Dimensions	1.57"L x 0.79"W x 1.57"H
Brand	Noctua
Power Connector Type	4-Pin
Voltage	5 Volts
Cooling Method	Air
Compatible Devices	Desktop
Noise Level	14.9 dB
Material	Fibre-glass reinforced PBT
Maximum Rotational Speed	5000 RPM
Global Trade Identification Number	09010018100136
Manufacturer	Noctua
Number of Items	1
Item model number	NF-A4x205VPWM
Item Weight	2.96 ounces
Item Dimensions LxWxH	0.79 x 1.57 x 1.57 inches
Color	Brown
ASIN	B071FNHVXN
Is Discontinued By Manufacturer	No
Date First Available	May 31, 2017

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

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