--- product_id: 51055764 title: "Noctua NF-A4x20 FLX, High-Performance Quiet Fan 40mm" brand: "noctua" price: "24090CFA" currency: XOF in_stock: true reviews_count: 13 url: https://www.desertcart.sn/products/51055764-noctua-nf-a4x20-flx-high-performance-quiet-fan-40mm store_origin: SN region: Senegal --- # >150,000 h MTTF reliability 5000 RPM max speed Ultra-quiet 14.9 dB(A) Noctua NF-A4x20 FLX, High-Performance Quiet Fan 40mm **Brand:** noctua **Price:** 24090CFA **Availability:** ✅ In Stock ## Summary > 🌀 Stay cool, stay silent — the pro’s choice for elite airflow. ## Quick Answers - **What is this?** Noctua NF-A4x20 FLX, High-Performance Quiet Fan 40mm by noctua - **How much does it cost?** 24090CFA with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.sn](https://www.desertcart.sn/products/51055764-noctua-nf-a4x20-flx-high-performance-quiet-fan-40mm) ## Best For - noctua enthusiasts ## Why This Product - Trusted noctua brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Compact powerhouse:** Slim 40x40x20 mm size fits perfectly in tight 1U spaces and network gear. - • **Plug & play versatility:** 3-pin FLX connector with OmniJoin adaptor set ensures seamless integration with proprietary headers. - • **Whisper-quiet operation:** Advanced Acoustic Optimisation frame keeps noise below 15 dB for distraction-free environments. - • **Vibration-free stability:** Includes anti-vibration mounts and premium SSO2 bearing for smooth, long-lasting operation. - • **Precision airflow control:** Three speed settings (5000/4400/3700 RPM) for tailored cooling performance. ## Overview The Noctua NF-A4x20 FLX is a premium 40x40x20 mm quiet fan designed for high-performance cooling in compact spaces like 1U servers and network devices. Featuring three adjustable speeds up to 5000 RPM, ultra-low noise levels under 15 dB, and a robust >150,000 hour MTTF lifespan, it combines advanced aerodynamic design with vibration-dampening mounts and versatile connectivity for professional-grade reliability and silent operation. ## Description Featuring advanced aerodynamic design measures such as Flow Acceleration Channels and Noctua’s AAO frame, the NF-A4x20 is a highly optimised, premium-quality quiet fan in size 40x20mm. The FLX version provides 5000/4400/3700rpm speed settings via the supplied Low-Noise Adaptors and includes the OmniJoin Adaptor Set for easy connection to proprietary fan headers. Its superb running smoothness, reference-class SSO2 bearing and Noctua’s trusted premium quality make it an elite choice for the highest demands. ## Features - Premium quiet fan, 40x40x20 mm, 12V, 3-pin Molex, 5000/4400/3700 RPM, max. 14.9 dB(A), >150,000 h MTTF - Award-winning A-series design with Flow Acceleration Channels and Advanced Acoustic Optimisation frame for superior quiet cooling performance - 40x20mm size ideal for 1U applications or replacing fans in network and storage equipment (routers, switches, NAS etc.) or other devices such as DVRs - 3-pin FLX version provides 5000/4400/3700rpm speed settings via Low-Noise Adaptors to fine-tune the fan for maximum airflow or near-silent operation - Includes anti-vibration mounts, fan screws, extension cable and OmniJoin adaptor set for connecting the fan to proprietary fan headers ## Technical Specifications | Specification | Value | |---------------|-------| | Asin | B071J8CZP9 | | Best Sellers Rank | 3,803 in Business, Industry & Science (See Top 100 in Business, Industry & Science) 32 in Thermal Management Products 87 in Fans & Cooling | | Brand | Noctua | | Compatible Devices | Desktop | | Cooling Method | Air | | Country Of Origin | China | | Customer Reviews | 4.8 4.8 out of 5 stars (2,604) 4.8 out of 5 stars | | Global Trade Identification Number | 09010018100112 | | Item Dimensions L X W X H | 40L x 40W x 20H millimetres | | Item Weight | 20 Grams | | Manufacturer | Noctua | | Manufacturer Part Number | NF-A4x20 FLX | | Max Rotational Speed | 5000 RPM | | Model Number | NF-A4x20 FLX | | Noise Level | 14.9 Decibels | | Number Of Items | 1 | | Number Of Packs | 1 | | Power Connector Type | 3-Pin | | Product Warranty | 6 year manufacturer’s warranty | | Unit Count | 1.0 count | | Voltage | 12 Volts | ## Product Details - **Brand:** Noctua - **Compatible devices:** Desktop - **Cooling method:** Air - **Global Trade Identification Number:** 09010018100112 - **Material:** Fibre-glass reinforced PBT - **Maximum rotational speed:** 5000 RPM - **Noise level:** 14.9 Decibels - **Power connector type:** 3-Pin - **Product dimensions:** 40L x 40W x 20H millimetres - **Voltage:** 12 Volts ## Images ![Noctua NF-A4x20 FLX, High-Performance Quiet Fan 40mm - Image 1](https://m.media-amazon.com/images/I/71lyRpVR4OL.jpg) ![Noctua NF-A4x20 FLX, High-Performance Quiet Fan 40mm - Image 2](https://m.media-amazon.com/images/I/81abh0+LmWL.jpg) ![Noctua NF-A4x20 FLX, High-Performance Quiet Fan 40mm - Image 3](https://m.media-amazon.com/images/I/71NYZ3JQcOL.jpg) ![Noctua NF-A4x20 FLX, High-Performance Quiet Fan 40mm - Image 4](https://m.media-amazon.com/images/I/71Ywc8LceeL.jpg) ![Noctua NF-A4x20 FLX, High-Performance Quiet Fan 40mm - Image 5](https://m.media-amazon.com/images/I/61xqdXxj1uL.jpg) ## Available Options This product comes in different **Size Name** options. ## Questions & Answers **Q: How can I use this fan with a 2 pin connection. I’ve just received it only to find my connection is 2 pin. Doh!** A: Black is (-), red is (+) and yellow is just the probe. You disconnect/cut the yellow one and you have two active wires. **Q: You replaced Hikvision nvr fan with Noc 40x20. What voltage did u use 12 or 5?** A: This Noctua fan is rated 5V and this is the voltage to use. **Q: has anyone tried this in a dan a4 case as a top fan? And would it be worth doing?** A: I don't know where it would fit at the top of the A4, as the riser cables and psu cable take up the space, there might just be enough space on the GPU side. I have this fan zip-tied to the CPU side panel. **Q: Good day, when will this item be back in stock again?** A: it is https://www.amazon.co.uk/gp/offer-listing/B009NQLT0M/ref=dp_olp_new_mbc?ie=UTF8&condition=new ## Customer Reviews ### ⭐⭐⭐⭐⭐ I’m fan ! *by on Reviewed in the United Kingdom 17 July 2026* Very good quality, super quiet and efficient, very good value with every connector included . ### ⭐⭐⭐⭐⭐ Excellent low noise replacement for OEM fans in network switch. *by on Reviewed in the United Kingdom 7 October 2025* I bought a POE switch (Drayek 1282 to be exact) - I had plans on mounting the switch to the wall behind my desk. I work in data centres a lot, so it shouldn't have surprised how loud the thing was. I took a gamble and bought a couple of these fans. The swap out was very easy - most PC kit will want a 12v fan (in case you were wondering to go with the 5v or 12v variant). The fans ship with everything you could need. My OEM fans connected to a 2 pin header on the main board. I cut the connectors from the old fans and used the included "OnmiJoin adaptor kit" to hook the new Noctua fans up to the original connectors. Again very easy. Mounting the fans in the chassis was easy as well.On power up the drop in noise was significant. Degrees of magnitude quieter. I ran for a day to check switch temperatures were staying low - all good. With that working well, I cracked open the switch again and added the (included) low noise adaptor - this just slows the fan RPM down a bit to reduce the fan noise. Again noticeable difference. Am now at the stage where the switch is under my desk and I can't hear it above the background noise anymore. Bearing in mind that with the OEM fans the noise levels were at the "extremely annoying " level on the other side of a closed door. Very happy - just wish I'd videoed the whole process. ### ⭐⭐⭐⭐⭐ Can't Beat Noctua Fans *by on Reviewed in the United Kingdom 28 June 2024* The Noctua NF-A4x20 FLX is a premium quiet fan known for its exceptional build quality and performance. Designed with advanced aerodynamic engineering, this 40x20mm fan provides efficient cooling while maintaining low noise levels. Its 3-pin connector ensures broad compatibility, making it ideal for a variety of applications, from computer cooling to DIY projects. Users appreciate its robust design, long lifespan, and the inclusion of multiple mounting options. Overall, the NF-A4x20 FLX is a top choice for anyone seeking a reliable and silent cooling solution. ## Frequently Bought Together - Noctua NF-A4x20 FLX, Premium Quiet Fan, 3-Pin (40x20mm, Brown) - Noctua NF-A4x10 FLX, Premium Quiet Fan, 3-Pin (40x10mm, Brown) --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.sn/products/51055764-noctua-nf-a4x20-flx-high-performance-quiet-fan-40mm](https://www.desertcart.sn/products/51055764-noctua-nf-a4x20-flx-high-performance-quiet-fan-40mm) --- *Product available on Desertcart Senegal* *Store origin: SN* *Last updated: 2026-08-21*