would anyone recommend this fan for a 3d printer hontend/part cooling fan?

Yes, we'd recommend using this fan for your 3d printer. (Please note that this is a 12V DC fan.)

What is de difference between noctua nf-a4x20 pwm and noctua nf-a4x20 flx?

one fan is pwm controllable (pwm), the other is not (flx). PWM controlling: https://en.wikipedia.org/wiki/Computer_fan_control

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NF-A4x20 PWM

Product ID: 82236934

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Details

Product Dimensions
1.57"L x x
Brand
Noctua
Power Connector Type
4-Pin
Voltage
12 Volts
Cooling Method
Air
Compatible Devices
Desktop

🔇Ultra-quiet max 14.9 dB(A)

⚙️40x40x20 mm compact size

🌬️Up to 5000 RPM with PWM control

Description

🌬️ Silent power in a compact frame — cool smarter, not louder!

COMPACT YET POWERFUL - Slim 40x40x20 mm design fits tight spaces like 1U servers, routers, and NAS devices without compromise.
WHISPER QUIET COOLING - Experience near-silent airflow with award-winning acoustic optimization, perfect for noise-sensitive environments.
LONG LASTING RELIABILITY - Engineered for >150,000 hours MTTF, delivering dependable performance for mission-critical equipment.
COMPLETE INSTALLATION KIT - Includes anti-vibration mounts, extension cables, and OmniJoin adaptors for seamless integration.
PRECISION PWM SPEED CONTROL - Automatic fan speed adjustment via 4-pin PWM header ensures optimal cooling and energy efficiency.

The NF-A4x20 PWM is a premium 40x40x20 mm quiet fan designed for professional-grade cooling in compact devices like 1U servers and network equipment. Featuring advanced acoustic optimization and Flow Acceleration Channels, it delivers powerful airflow up to 5000 RPM with minimal noise (max 14.9 dB(A)). Its 4-pin PWM interface enables precise automatic speed control, while a robust >150,000 hour MTTF ensures long-term reliability. The fan comes with a full accessory kit for easy, vibration-free installation.

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