--- product_id: 51055764 title: "NF-A4x20 FLX" brand: "noctua" price: "AED 102" currency: AED in_stock: true reviews_count: 13 category: "Noctua" url: https://www.desertcart.ae/products/51055764-nf-a4x20-flx store_origin: AE region: United Arab Emirates --- # 5000 RPM max speed Ultra-quiet 14.9 dB(A) >150,000 h MTTF durability NF-A4x20 FLX **Brand:** noctua **Price:** AED 102 **Availability:** ✅ In Stock ## Summary > 🌀 Silence meets power — cool smarter, not louder. ## Quick Answers - **What is this?** NF-A4x20 FLX by noctua - **How much does it cost?** AED 102 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.ae](https://www.desertcart.ae/products/51055764-nf-a4x20-flx) ## 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 - • **Trusted longevity:** SSO2 bearing & 6-year warranty for relentless performance - • **Compact powerhouse:** 40x20mm size ideal for 1U servers, NAS & network gear upgrades - • **Customizable speed modes:** 3-pin FLX with 3 RPM settings for perfect balance of power & quiet - • **Vibration-free operation:** Integrated anti-vibration mounts for whisper-quiet stability - • **Precision airflow engineering:** Flow Acceleration Channels boost efficiency & silence ## Overview The Noctua NF-A4x20 FLX is a premium 40x20mm quiet fan designed for high-performance cooling in compact devices like 1U servers, NAS, and network equipment. Featuring advanced aerodynamic Flow Acceleration Channels, a second-generation SSO2 bearing for durability, and ultra-quiet operation at just 14.9 dB(A), it offers customizable speeds (3700/4400/5000 RPM) via Low-Noise Adaptors. Included anti-vibration mounts and a 6-year warranty make it a reliable, whisper-quiet upgrade for professionals demanding silent, efficient airflow. ## 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: Not a peep - Replacing like for like in a Netgear switch, these didn't work at all. Review: Damaged Item - Item came up damaged, seller offered UPS return that is completely unavailable where I am from, closest one is 45min drive, it would cost me more that it is worth refund, I got stock with damaged item ## 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 | 4,585 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 43 in Thermal Management Products 94 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 2,508 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 ![NF-A4x20 FLX - Image 1](https://m.media-amazon.com/images/I/71lyRpVR4OL.jpg) ![NF-A4x20 FLX - Image 2](https://m.media-amazon.com/images/I/81abh0+LmWL.jpg) ![NF-A4x20 FLX - Image 3](https://m.media-amazon.com/images/I/71NYZ3JQcOL.jpg) ![NF-A4x20 FLX - Image 4](https://m.media-amazon.com/images/I/71Ywc8LceeL.jpg) ![NF-A4x20 FLX - 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 ### ⭐ Not a peep *by D***R on 3 September 2023* Replacing like for like in a Netgear switch, these didn't work at all. ### ⭐ Damaged Item *by A***A on 18 December 2020* Item came up damaged, seller offered UPS return that is completely unavailable where I am from, closest one is 45min drive, it would cost me more that it is worth refund, I got stock with damaged item ### ⭐ Loud *by S***S on 11 November 2022* Not silent forgot to send it back ## 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.ae/products/51055764-nf-a4x20-flx](https://www.desertcart.ae/products/51055764-nf-a4x20-flx) --- *Product available on Desertcart United Arab Emirates* *Store origin: AE* *Last updated: 2026-06-23*