{"product_id":"noctua-nf-a4x20-5v-pwm-40x20mm-quiet-cooling-fan","title":"Noctua NF-A4X20 - 5V PWM 40x20mm Quiet Cooling Fan","description":"\u003cp\u003eFeaturing advanced aerodynamic design measures such as Flow Acceleration Channels and an AAO frame, the NF-A4x20 \u003cstrong\u003e5V PWM\u003c\/strong\u003e is a PWM-enabled 5V variant of \u003ca title=\"Noctua\" href=\"\/hi\/collections\/noctua\"\u003eNoctua’s\u003c\/a\u003e highly optimised, premium quality quiet \u003cstrong\u003e40x20mm fan\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eThe custom-designed NE-FD3 PWM IC that integrates Smooth Commutation Drive technology and Noctua’s reference class SSO2 bearings guarantee superb running smoothness and excellent long-term stability. Topped off with modular cabling, the OmniJoin Adaptor Set and a 6-year manufacturer’s warranty, the NF-A4x20 5V PWM is a premium choice for demanding 5V applications that require PWM control.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePLEASE NOTE:\u003c\/strong\u003e Being a \u003cstrong\u003e5V fan\u003c\/strong\u003e, the NF-A4x20 5V PWM \u003cstrong\u003ecannot be run at 12V and will be damaged when used with typical 12V power sources such as PC motherboard fan headers.\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003ePopular with Raspberry Pi users!\u003c\/h3\u003e\n\u003cp\u003eAs it's a \u003cstrong\u003e5V PWM fan\u003c\/strong\u003e, the NF-A4x20 has become a popular choice for \u003ca title=\"Raspberry Pi Store\" href=\"\/hi\/collections\/raspberry-pi-store\"\u003eRaspberry Pi\u003c\/a\u003e users hacking custom cooling setups for their projects! For example, there's a \u003ca href=\"https:\/\/github.com\/alexfukahori\/rpi-pwm-fan-control\"\u003eGitHub repo here with some PWM fan control code\u003c\/a\u003e and a \u003ca href=\"https:\/\/github.com\/folkhack\/raspberry-pi-pwm-fan-2\"\u003edifferent one here too with some good diagrams\u003c\/a\u003e \u003cem\u003e(have a Google though, there are many ways to achieve the same thing)\u003c\/em\u003e. We found a few 3D prints to use these fans with a Raspberry Pi too!\u003c\/p\u003e\n\u003ch3\u003e40x20mm size\u003c\/h3\u003e\n\u003cp\u003eCompared to Noctua’s award-winning \u003ca title=\"Noctua NF-A4X10\" href=\"\/hi\/products\/noctua-nf-a4x10-5v-pwm-40x10mm-quiet-cooling-fan\"\u003eNF-A4x10\u003c\/a\u003e, 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.\u003c\/p\u003e\n\u003ch3\u003e5V PWM version\u003c\/h3\u003e\n\u003cp\u003eMany devices such as network or storage solutions use 5-volt 40mm fans with PWM speed control. With the same operating voltage, PWM support and the included OmniJoin™ adaptor set that makes it compatible with proprietary fan headers, the NF-A4x20 5V PWM is ideal for replacing noisy or broken 5V 40mm fans with PWM.\u003c\/p\u003e\n\u003ch3\u003ePolarity protection\u003c\/h3\u003e\n\u003cp\u003eAs many devices using 5V fans feature proprietary connectors and documentation of the pin alignment may not be available, the fan features an integrated diode for polarity protection. This way, you’re on the safe side if you accidentally connect it with reverse polarity.\u003c\/p\u003e\n\u003ch3\u003eFlow Acceleration Channels\u003c\/h3\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\u003ch3\u003eAAO Frame\u003c\/h3\u003e\n\u003cp\u003eNoctua’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.\u003c\/p\u003e\n\u003ch3\u003eStepped Inlet Design\u003c\/h3\u003e\n\u003cp\u003eNoctua’s Stepped Inlet Design adds turbulence to the influx in order to facilitate the transition from laminar flow to turbulent flow, which reduces tonal intake noise, improves flow attachment and increases suction capacity, especially in space-restricted environments.\u003c\/p\u003e\n\u003ch3\u003eInner Surface Microstructures\u003c\/h3\u003e\n\u003cp\u003eWith the tips of the fan blades ploughing through the boundary layer created by the Inner Surface Microstructures, flow separation from the suction side of the blades is significantly suppressed, which results in reduced blade passing noise and improved airflow and pressure efficiency.\u003c\/p\u003e\n\u003ch3\u003eIntegrated Anti-Vibration Pads\u003c\/h3\u003e\n\u003cp\u003eIntegrated 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.\u003c\/p\u003e\n\u003ch3\u003eSSO2 bearing\u003c\/h3\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\u003ch3\u003eCustom-designed PWM IC with SCD\u003c\/h3\u003e\n\u003cp\u003eSupporting fully automatic PWM speed control, the fan uses Noctua’s custom-designed NE-FD3 5V PWM IC that integrates Smooth Commutation Drive (SCD) technology. By providing smoother torque impulses, SCD suppresses PWM switching noises and thus makes the fan quieter at low speeds.\u003c\/p\u003e\n\u003ch3\u003eOmniJoin adaptor set\u003c\/h3\u003e\n\u003cp\u003eMany devices featuring 40mm fans use proprietary fan headers, so the NF-A4x20 comes with Noctua’s OmniJoin adaptor set. Just cut the original fan’s cable, fix it to the adaptor using the supplied 3M Scotchlok connectors and you can plug the NF-A4x20 to proprietary fan headers!\u003c\/p\u003e\n\u003ch3\u003eExtensive cabling options\u003c\/h3\u003e\n\u003cp\u003eThe fan’s short 20cm primary cable minimises cable clutter in typical applications while the supplied 30cm extension provides extended reach when necessary. Both cables are fully sleeved and a 4-pin y-cable allows the connection of a second fan to the same PWM fan header for automatic control.\u003c\/p\u003e\n\u003ch3\u003e6-year manufacturer’s warranty\u003c\/h3\u003e\n\u003cp\u003eNoctua fans are renowned for their impeccable quality and outstanding longevity. Like all Noctua fans, the NF-A4x20 features an MTTF of more than 150.000 hours rating and comes with a full 6-year manufacturer’s warranty.\u003c\/p\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable style=\"height: 288px;\" width=\"516\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 18px;\"\u003e\n\u003ctd style=\"height: 18px; width: 200.297px;\"\u003e\u003cstrong\u003eSize\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 18px; width: 305.703px;\" data-product-id=\"5737\"\u003e40x40x20 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 18px;\"\u003e\n\u003ctd style=\"height: 18px; width: 200.297px;\"\u003e\u003cstrong\u003eScrew hole spacings\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 18px; width: 305.703px;\" data-product-id=\"5737\"\u003e32 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 18px;\"\u003e\n\u003ctd style=\"height: 18px; width: 200.297px;\"\u003e\u003cstrong\u003eConnector\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 18px; width: 305.703px;\" data-product-id=\"5737\"\u003e4-pin PWM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 18px;\"\u003e\n\u003ctd style=\"height: 18px; width: 200.297px;\"\u003e\u003cstrong\u003eBearing\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 18px; width: 305.703px;\" data-product-id=\"5737\"\u003e\u003ca href=\"https:\/\/noctua.at\/en\/sso2-bearing\"\u003eSSO2\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 18px;\"\u003e\n\u003ctd style=\"height: 18px; width: 200.297px;\"\u003e\u003cstrong\u003eBlade Geometry\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 18px; width: 305.703px;\" data-product-id=\"5737\"\u003eA-Series with \u003ca href=\"https:\/\/noctua.at\/en\/flow-acceleration-channels\"\u003eFlow Acceleration Channels\u003c\/a\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 18px;\"\u003e\n\u003ctd style=\"height: 18px; width: 200.297px;\"\u003e\u003cstrong\u003eFrame Technology\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 18px; width: 305.703px;\" data-product-id=\"5737\"\u003eAAO (\u003ca href=\"https:\/\/noctua.at\/en\/aao-frame\"\u003eAdvanced Acoustic Optimisation\u003c\/a\u003e)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 18px;\"\u003e\n\u003ctd style=\"height: 18px; width: 200.297px;\"\u003e\u003cstrong\u003eRotational Speed (+\/- 10%)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 18px; width: 305.703px;\" data-product-id=\"5737\"\u003e5000 RPM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 18px;\"\u003e\n\u003ctd style=\"height: 18px; width: 200.297px;\"\u003e\u003cstrong\u003eAirflow\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 18px; width: 305.703px;\" data-product-id=\"5737\"\u003e5.5 CFM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 18px;\"\u003e\n\u003ctd style=\"height: 18px; width: 200.297px;\"\u003e\u003cstrong\u003eMin. rotational speed\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 18px; width: 305.703px;\" data-product-id=\"5737\"\u003e1100 RPM (PWM, ±20%)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 18px;\"\u003e\n\u003ctd style=\"height: 18px; width: 200.297px;\"\u003e\u003cstrong\u003eAcoustical Noise\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 18px; width: 305.703px;\" data-product-id=\"5737\"\u003e14.9 dB(A)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 18px;\"\u003e\n\u003ctd style=\"height: 18px; width: 200.297px;\"\u003e\u003cstrong\u003eStatic Pressure\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 18px; width: 305.703px;\" data-product-id=\"5737\"\u003e2.26 mm H2O\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 18px;\"\u003e\n\u003ctd style=\"height: 18px; width: 200.297px;\"\u003e\u003cstrong\u003eMax. Input Power\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 18px; width: 305.703px;\" data-product-id=\"5737\"\u003e0.5 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 18px;\"\u003e\n\u003ctd style=\"height: 18px; width: 200.297px;\"\u003e\u003cstrong\u003eMax. Input Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 18px; width: 305.703px;\" data-product-id=\"5737\"\u003e0.1 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 18px;\"\u003e\n\u003ctd style=\"height: 18px; width: 200.297px;\"\u003e\u003cstrong\u003eVoltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 18px; width: 305.703px;\" data-product-id=\"5737\"\u003e5 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 18px;\"\u003e\n\u003ctd style=\"height: 18px; width: 200.297px;\"\u003e\u003cstrong\u003eMTBF\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 18px; width: 305.703px;\"\u003e150,000 h\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 18px;\"\u003e\n\u003ctd style=\"height: 18px; width: 200.297px;\"\u003e\u003cstrong\u003eEAN barcode\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 18px; width: 305.703px;\" data-product-id=\"5737\"\u003e9010018100136\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eResources\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/noctua.at\/pub\/media\/blfa_files\/manual\/noctua_nf_a4x20_5v_pwm_manual_en_web.pdf\"\u003eInstallation Manual (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/noctua.at\/pub\/media\/blfa_files\/infosheet\/noctua_nf_a4x20_5v_pwm_datasheet_en_web_1.pdf\"\u003eInformation Sheet (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePackage Contents\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eNF-A4x20 PWM 5V fan\u003c\/li\u003e\n\u003cli\u003e4-pin y-cable\u003c\/li\u003e\n\u003cli\u003e30cm extension cable\u003c\/li\u003e\n\u003cli\u003eOmniJoin adaptor set\u003c\/li\u003e\n\u003cli\u003eNA-AV3 anti-vibration mounts\u003c\/li\u003e\n\u003cli\u003eFan screws\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Noctua","offers":[{"title":"Default Title","offer_id":50847123833105,"sku":"106183","price":14.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0901\/6285\/6209\/files\/noctua-nf-a4x20-5v-pwm-40x20mm-quiet-cooling-fan-noctua-106183-72103555334529.jpg?v=1735207398","url":"https:\/\/abcd3032.myshopify.com\/hi\/products\/noctua-nf-a4x20-5v-pwm-40x20mm-quiet-cooling-fan","provider":"Tayyab Zak","version":"1.0","type":"link"}