--- product_id: 51055796 title: "NF-A4x20 PWM" brand: "noctua" price: "150 zł" currency: PLN in_stock: true reviews_count: 8 category: "Noctua" url: https://www.desertcart.pl/products/51055796-nf-a4x20-pwm store_origin: PL region: Poland --- # >150,000 h MTTF reliability 5000 RPM max speed Ultra-quiet 14.9 dB(A) NF-A4x20 PWM **Brand:** noctua **Price:** 150 zł **Availability:** ✅ In Stock ## Summary > 🌀 Silence Meets Performance: The Ultimate Mini Fan Upgrade You Didn’t Know You Needed ## Quick Answers - **What is this?** NF-A4x20 PWM by noctua - **How much does it cost?** 150 zł with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.pl](https://www.desertcart.pl/products/51055796-nf-a4x20-pwm) ## 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:** Engineered with premium materials and backed by a 6-year warranty for unmatched durability and peace of mind. - • **Compact Yet Mighty:** Slim 40x40x20 mm size fits 1U servers, NAS, routers, and DVRs without compromise. - • **Precision PWM Control:** 4-pin PWM interface enables smart, automatic fan speed adjustments for optimal thermal management. - • **Whisper-Quiet Powerhouse:** Experience near-silent cooling at up to 5000 RPM, perfect for noise-sensitive environments. - • **Complete Installation Kit:** Includes anti-vibration mounts, extension cables, and OmniJoin adaptors for versatile, hassle-free setup. ## Overview The Noctua NF-A4x20 PWM is a premium 40x40x20 mm cooling fan designed for compact devices like 1U servers and NAS units. It features a 4-pin PWM connector for automatic speed control up to 5000 RPM, delivering powerful airflow at an ultra-quiet noise level of just 14.9 dB(A). Engineered with advanced aerodynamic design and acoustic optimization, it ensures superior cooling with minimal sound. The fan comes with a comprehensive accessory kit including anti-vibration mounts and extension cables, and boasts a remarkable mean time to failure of over 150,000 hours, backed by a 6-year manufacturer warranty. ## Description Premium quiet 40x20mm fan with advanced aerodynamic design for superior cooling performance. Features 4-pin PWM control for automatic speed adjustment. Review: Quieter than a mouses fart!!! - Bought an old 4 bay 1U rackmount NAS from eb** and was shocked how noisy it was. 60+db while building a raid array. So thought not happening and went looking for silent fans, found these and read the reviews and being a Scotsman I was like seriously? for a wee fan like that? and there were 3 system fans and 1 power supply fan. I was aboot greetin. Bought the 4 fans and proceeded to swap them out taking measurements along the way. After replacing the 3 system fans the noise level dropped to a low of 21db and peak of 25db system temp 1degree lower CPU temp 1 degree higher. I then swapped the power supply fan and set the system to rebuilding a raid volume, which is possibly the most intensive thing a NAS is going to do and it is quite happily purring along at a peak of 18 db with a system temp 2 degrees lower and a CPU temp 1 degree higher than factory fitted fans. I should mention that I am using the low noise adaptor cables that come supplied in the fan kit for the 3 system fans. The kit is well supplied with everything you need and gives you options aplenty for extensions and fitting methods. The quality seems to be superb and longevity is backed by their guarantee. I will be buying these fans exclusively from now on and upgrading all fans in my servers. The only nark I would have is the colour! My god it's awful lets have some bright colourful options yellow/black red/black etc, something to indicate that it's a premium high performance fan. Lookswise it definitely needs some cool. Other wise very happy if not skint wee laddie but well worth it. Review: SILENT! - Epic little fan. Silent at full speed can’t hear it at all. Got it cooling my vrm heatsink. May get another! ## Features - Premium quiet fan, 40x40x20 mm, 12V, 4-pin PWM, max. 5000 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 servers or replacing fans in network and storage equipment (routers, switches, NAS etc.) or other devices such as DVRs - 4-pin PWM version for automatic speed control via 4-pin PWM fan headers, 5000rpm maximum speed (4400rpm with supplied Low-Noise Adaptor) - Includes anti-vibration mounts, fan screws, extension cable, y-cable and OmniJoin adaptor set for connecting the fan to proprietary fan headers ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07125KWG1 | | Air Flow Capacity | 9.4 Cubic Metres Per Hour | | Best Sellers Rank | 5,557 in Computers & Accessories ( See Top 100 in Computers & Accessories ) 22 in Thermal Management Products 60 in Fans & Cooling | | Brand | Noctua | | Compatible Devices | Desktop | | Compatible devices | Desktop | | Cooling Method | forced air | | Cooling method | forced air | | Country Of Origin | China | | Customer Reviews | 4.8 out of 5 stars 1,594 Reviews | | Global Trade Identification Number | 09010018100105 | | Item Dimensions L x W x H | 40L x 40W x 20H millimetres | | Manufacturer | Noctua | | Manufacturer Part Number | NF-A4x20 PWM | | Material | Fibre-glass reinforced PBT | | Max Rotational Speed | 5000 RPM | | Model Number | NF-A4x20 PWM | | Noise Level | 14.9 Decibels | | Number of Items | 1 | | Power Connector Type | 4-Pin | | Power connector type | 4-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 - **Air flow capacity:** 9.4 Cubic Metres Per Hour - **Brand:** Noctua - **Compatible devices:** Desktop - **Cooling method:** forced air - **Material:** Fibre-glass reinforced PBT - **Maximum rotational speed:** 5000 RPM - **Noise level:** 14.9 Decibels - **Power connector type:** 4-Pin - **Product dimensions:** 40L x 40W x 20H millimetres - **Voltage:** 12 Volts ## Images ![NF-A4x20 PWM - Image 1](https://m.media-amazon.com/images/I/71lyRpVR4OL.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 ### ⭐⭐⭐⭐⭐ Quieter than a mouses fart!!! *by J***. on 4 May 2025* Bought an old 4 bay 1U rackmount NAS from eb** and was shocked how noisy it was. 60+db while building a raid array. So thought not happening and went looking for silent fans, found these and read the reviews and being a Scotsman I was like seriously? for a wee fan like that? and there were 3 system fans and 1 power supply fan. I was aboot greetin. Bought the 4 fans and proceeded to swap them out taking measurements along the way. After replacing the 3 system fans the noise level dropped to a low of 21db and peak of 25db system temp 1degree lower CPU temp 1 degree higher. I then swapped the power supply fan and set the system to rebuilding a raid volume, which is possibly the most intensive thing a NAS is going to do and it is quite happily purring along at a peak of 18 db with a system temp 2 degrees lower and a CPU temp 1 degree higher than factory fitted fans. I should mention that I am using the low noise adaptor cables that come supplied in the fan kit for the 3 system fans. The kit is well supplied with everything you need and gives you options aplenty for extensions and fitting methods. The quality seems to be superb and longevity is backed by their guarantee. I will be buying these fans exclusively from now on and upgrading all fans in my servers. The only nark I would have is the colour! My god it's awful lets have some bright colourful options yellow/black red/black etc, something to indicate that it's a premium high performance fan. Lookswise it definitely needs some cool. Other wise very happy if not skint wee laddie but well worth it. ### ⭐⭐⭐⭐⭐ SILENT! *by A***H on 6 January 2026* Epic little fan. Silent at full speed can’t hear it at all. Got it cooling my vrm heatsink. May get another! ### ⭐⭐⭐⭐⭐ Great little fan *by T***Y on 27 September 2017* I have purchased several Noctua fans of varying types and sizes and was really happy to see that they also make a range of 40mm PWM fans. I purchased the NF-A4x20 fan to replace the fan on an Icy Dock MB996SP-6SB internal 6 bay SATA enclosure. The fan on the enclosure is not only very noisy, but can only be controlled with a switch on the rear of the enclosure and only be set to High, Medium or Off altogther. Like most other Noctua fans I've purcahsed, the packaging is really well designed and the box contains a number of extra bits such as an extension cable, low noise adapter, splitter cable and a few other bits. Installing this fan was a little more involved as I needed to open the Icy Dock enclosure to disconnect the existing fan and as that fan was only 10mm deep I needed some different screws to mount the Noctua fan which is 20mm deep. Now that the fan is installed and connected to a PWM header on my mother board I can control the speed with software. At 2500 RPM (50%) the fan is completely silent and only can be heard slightly when running at 100%. It's a great fan and I'm very happy with it. Although I really like Noctua's products I'm not so keen on the colour scheme, however as this fan is concealed away in my PC and can't be seen then it doesn't bother me at all. ## Frequently Bought Together - Noctua NF-A4x20 PWM, Premium Quiet Fan, 4-Pin (40x20mm, Brown) - Noctua NF-A6x25 PWM, Premium Quiet Fan, 4-Pin (60mm, Brown) - Noctua NF-A8 PWM, Premium Quiet Fan, 4-Pin (80mm, 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.pl/products/51055796-nf-a4x20-pwm](https://www.desertcart.pl/products/51055796-nf-a4x20-pwm) --- *Product available on Desertcart Poland* *Store origin: PL* *Last updated: 2026-05-01*