--- product_id: 270153121 title: "Noctua NF-A4x20 FLX, Premium Quiet Fan, 3-Pin (40x20mm, Brown)" brand: "noctua" price: "1769330₫" currency: VND in_stock: true reviews_count: 1 category: "Noctua" url: https://www.desertcart.vn/products/270153121-noctua-nf-a4x20-flx-premium-quiet-fan-3-pin-40x20mm store_origin: VN region: Vietnam --- # 3-speed 3700-5000 RPM FLX control 40x40x20mm compact size Ultra-quiet max 14.9 dB(A) Noctua NF-A4x20 FLX, Premium Quiet Fan, 3-Pin (40x20mm, Brown) **Brand:** noctua **Price:** 1769330₫ **Availability:** ✅ In Stock ## Summary > 🌀 Elevate your gear’s cool factor—silence and power in perfect harmony! ## Quick Answers - **What is this?** Noctua NF-A4x20 FLX, Premium Quiet Fan, 3-Pin (40x20mm, Brown) by noctua - **How much does it cost?** 1769330₫ with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.vn](https://www.desertcart.vn/products/270153121-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 - • **Compact Powerhouse:** Ultra-slim 40x40x20mm design fits perfectly in tight 1U spaces, ideal for network gear, NAS, and DVRs. - • **Whisper-Quiet Cooling:** Experience near-silent airflow with industry-leading 14.9 dB(A) noise levels—because your workspace deserves peace. - • **Plug & Play Versatility:** Includes OmniJoin™ adaptor set and 3-pin Molex connector for seamless integration with proprietary fan headers. - • **Award-Winning Aerodynamics:** Flow Acceleration Channels and Advanced Acoustic Optimisation frame deliver superior airflow with minimal noise. - • **Precision 3-Speed Flexibility:** Tailor your cooling with three RPM settings (3700/4400/5000) for optimal performance and energy efficiency. ## Overview The Noctua NF-A4x20 FLX is a premium 40x40x20mm quiet fan engineered for professional-grade cooling in compact spaces. Featuring advanced aerodynamic design, ultra-low noise levels (max 14.9 dB(A)), and flexible 3-speed control, it’s the go-to upgrade for network equipment, NAS, and other sensitive devices demanding silent, reliable airflow. ## 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. Review: Amazing silent fan - I order two silent fans and replace a very loud original fans for network switch. Amazing performance no sound at all. ## Features - Premium quiet fan, 40x40x20 mm, 12V, 3-pin Molex, 5000/4400/370 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 ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B071J8CZP9 | | Best Sellers Rank | #7,689 in Computers ( See Top 100 in Computers ) #40 in Computer Case Fans | | Brand | Noctua | | Brand Name | Noctua | | Compatible Devices | Desktop, Laptop | | Compatible devices | Desktop, Laptop | | Cooling Method | Air | | Cooling method | Air | | Customer Reviews | 4.8 out of 5 stars 2,470 Reviews | | Global Trade Identification Number | 09010018100112 | | Item Dimensions L x W x H | 20L x 40W x 40H millimeters | | Item Weight | 50 Grams | | Manufacturer | Noctua | | Material Type | Fibre-glass reinforced PBT | | Maximum Rotational Speed | 3500 RPM | | Model | NF-A4x20 FLX | | Noise Level | 14.9 Decibels | | Number of Items | 1 | | Part Number | NF-A4x20 FLX | | Power Connector Type | 3-Pin | | Power connector type | 3-Pin | | Product dimensions | 20L x 40W x 40H millimeters | | Unit Count | 1.0 Count | | Voltage | 12 Volts | ## Product Details - **Brand:** Noctua - **Cooling method:** Air - **Power connector type:** 3-Pin - **Product dimensions:** 20L x 40W x 40H millimeters - **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) ## Available Options This product comes in different **Size, Style** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Amazing silent fan *by R***X on 12 November 2022* I order two silent fans and replace a very loud original fans for network switch. Amazing performance no sound at all. ## 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.vn/products/270153121-noctua-nf-a4x20-flx-premium-quiet-fan-3-pin-40x20mm](https://www.desertcart.vn/products/270153121-noctua-nf-a4x20-flx-premium-quiet-fan-3-pin-40x20mm) --- *Product available on Desertcart Vietnam* *Store origin: VN* *Last updated: 2026-05-23*