--- product_id: 51055764 title: "Noctua NF-A4x20 FLX, Premium Quiet Fan, 3-Pin (40x20mm, Brown)" brand: "noctua" price: "S/.145" currency: PEN in_stock: true reviews_count: 13 category: "Noctua" url: https://www.desertcart.pe/products/51055764-noctua-nf-a4x20-flx-premium-quiet-fan-3-pin-40x20mm store_origin: PE region: Peru --- # >150,000 h MTTF reliability 5000 RPM max speed Ultra-quiet 14.9 dB(A) Noctua NF-A4x20 FLX, Premium Quiet Fan, 3-Pin (40x20mm, Brown) **Brand:** noctua **Price:** S/.145 **Availability:** ✅ In Stock ## Summary > 🛠️ Silent cooling that means business — keep your gear cool, calm, and collected. ## Quick Answers - **What is this?** Noctua NF-A4x20 FLX, Premium Quiet Fan, 3-Pin (40x20mm, Brown) by noctua - **How much does it cost?** S/.145 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.pe](https://www.desertcart.pe/products/51055764-noctua-nf-a4x20-flx-premium-quiet-fan-3-pin-40x20mm) ## 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 - • **Built to Last:** Crafted with fibre-glass reinforced PBT and backed by a 6-year warranty, ensuring long-term, dependable cooling performance. - • **Compact Yet Mighty:** 40x40x20 mm size fits perfectly in tight 1U spaces, ideal for network gear, NAS, and DVRs without compromise. - • **Whisper-Quiet Power:** Experience premium airflow at a barely-there 14.9 dB noise level—your workspace’s new silent hero. - • **Precision Speed Control:** 3-pin FLX design with three RPM settings (5000/4400/3700) lets you dial in the perfect balance of cooling and silence. - • **Vibration-Free Operation:** Includes anti-vibration mounts and OmniJoin adaptor for seamless, rattle-free installation and compatibility. ## Overview The Noctua NF-A4x20 FLX is a premium 40x40x20 mm 12V fan engineered for ultra-quiet, high-performance cooling in compact devices like network switches and NAS units. Featuring advanced aerodynamic design, three adjustable speed settings, and anti-vibration accessories, it delivers reliable airflow at a whisper-quiet 14.9 dB(A) noise level with an exceptional lifespan exceeding 150,000 hours. Perfect for professionals seeking silent, efficient thermal management in tight spaces. ## Description Product 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. 40x20mm size Compared to Noctua’s award-winning NF-A4x10, the NF-A4x20 is twice as thick, which allows for increased static pressure performance and makes the NF-A4x20 ideal for demanding applications with high flow resistance. Flow Acceleration Channels The NF-A4x20 impeller features suction side Flow Acceleration Channels. By speeding up the airflow at the crucial outer blade regions, this measure reduces suction side flow separation and thus leads to better efficiency and lower vortex noise. SSO2 Bearing The NF-A4x20 features the further optimised second generation of Noctua's renowned, time-tested SSO bearing. With SSO2, the rear magnet is placed closer to the axis to provide even better stabilisation, precision and durability. Integrated Anti-Vibration Pads Integrated Anti-Vibration Pads made from extra-soft silicone minimise the transmission of minute vibrations while maintaining full compatibility with all standard mounting systems and fan clips used on heatsinks. Scope of delivery NA-RC10 Low-Noise Adaptor (L.N.A) NA-RC12 Ultra-Low-Noise Adaptor (U.L.N.A) NA-EC2 30cm extension cable OmniJoin adaptor set 4x NA-AV3 anti-vibration mounts Fan screws AAO frame Noctua's AAO (Advanced Acoustic Optimisation) frames feature integrated anti-vibration pads as well as Noctua's proprietary Stepped Inlet Design and Inner Surface Microstructures, both of which further refine the fan's performance/noise efficiency. Review: Good product - Very quiet fan, happy with it Review: Excellent low noise replacement for OEM fans in network switch. - 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. ## 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 | 9,271 in Computers & Accessories ( See Top 100 in Computers & Accessories ) 53 in Thermal Management Products 110 in Fans & Cooling | | Brand | Noctua | | Compatible Devices | Desktop | | Compatible devices | Desktop | | Cooling Method | Air | | Cooling method | Air | | Country Of Origin | China | | Customer Reviews | 4.8 out of 5 stars 2,503 Reviews | | Global Trade Identification Number | 09010018100112 | | Item Dimensions L x W x H | 40L x 40W x 20H millimetres | | Item Weight | 50 Grams | | Manufacturer | Noctua | | Manufacturer Part Number | NF-A4x20 FLX | | Material | Fibre-glass reinforced PBT | | Max Rotational Speed | 5000 RPM | | Model Number | NF-A4x20 FLX | | Noise Level | 14.9 Decibels | | Number of Items | 1 | | Power Connector Type | 3-Pin | | Power connector type | 3-Pin | | Product Warranty | 6 year manufacturer’s warranty | | Product dimensions | 40L x 40W x 20H millimetres | | 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, Premium Quiet Fan, 3-Pin (40x20mm, Brown) - Image 1](https://m.media-amazon.com/images/I/71lyRpVR4OL.jpg) ![Noctua NF-A4x20 FLX, Premium Quiet Fan, 3-Pin (40x20mm, Brown) - Image 2](https://m.media-amazon.com/images/I/81abh0+LmWL.jpg) ![Noctua NF-A4x20 FLX, Premium Quiet Fan, 3-Pin (40x20mm, Brown) - Image 3](https://m.media-amazon.com/images/I/71NYZ3JQcOL.jpg) ![Noctua NF-A4x20 FLX, Premium Quiet Fan, 3-Pin (40x20mm, Brown) - Image 4](https://m.media-amazon.com/images/I/71Ywc8LceeL.jpg) ![Noctua NF-A4x20 FLX, Premium Quiet Fan, 3-Pin (40x20mm, Brown) - Image 5](https://m.media-amazon.com/images/I/61xqdXxj1uL.jpg) ## 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 ### ⭐⭐⭐⭐⭐ Good product *by B***Z on 15 March 2026* Very quiet fan, happy with it ### ⭐⭐⭐⭐⭐ Excellent low noise replacement for OEM fans in network switch. *by T***M on 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. ### ⭐⭐⭐⭐⭐ A great upgrade for a flex PSU - very impressed so far *by S***R on 14 December 2025* If you have a flex PSU for pc building ; especially in a SFF build. This totally transformed the fan noise This is the best upgrade for a flex PSU The standard fans with my flex PSU sounded like a jet engine This takes the level below CPU fan noise level Pc case was a jonsbo nv10 ## 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.pe/products/51055764-noctua-nf-a4x20-flx-premium-quiet-fan-3-pin-40x20mm](https://www.desertcart.pe/products/51055764-noctua-nf-a4x20-flx-premium-quiet-fan-3-pin-40x20mm) --- *Product available on Desertcart Peru* *Store origin: PE* *Last updated: 2026-05-22*