# Noctua NF-A4x20 PWM Fan (40x20mm, 12V, 4-Pin) | Superior Quiet Cooling for Servers & Networking **Brand:** Noctua **SKU:** cfs2653 **ASIN:** B071W93333 **Canonical URL:** https://crowcrowcrow.com/p/noctua-nf-a4x20-pwm-quiet-fan-4-pin-40x20mm-brown-2/cfs2653 **Category:** electronics **Subcategory:** Categories **Availability:** in_stock **Price (INR, all-inclusive):** ₹2,646 **Discount:** 4% **Customer rating:** 4.80/5 from 2,067 ratings ## Description Noctua NF-A4x20 PWM fan (40x20mm, 12V, 4-pin) delivers ultra-quiet cooling for servers and networking gear. With 5000 RPM speed and low noise, it's ideal for Indian data centers and home offices. Arrives duty-paid via ExpressBox. ## Highlights - Ultra-Quiet Operation — Achieves a maximum of 14.9 dB(A) noise level, with a Low-Noise Adaptor reducing speed to 4400 RPM for near-silent operation in sensitive Indian office or home setups. - Optimised for Servers & Networking — The 40x20mm size is perfect for compact 1U servers, routers, switches, and NAS devices, ensuring vital equipment stays cool and reliable under sustained loads. - Advanced PWM Speed Control — The 4-pin PWM connector allows the motherboard to automatically adjust fan speed based on system temperature, optimizing cooling efficiency and reducing power consumption. - Exceptional Durability & Longevity — Constructed from fibre-glass reinforced PBT with a MTTF of over 150,000 hours, this fan is built for long-term, reliable operation in demanding Indian conditions. ## Key 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 ## Why choose this product **Engineered for Silent, Reliable Cooling** — Noctua's NF-A4x20 PWM fan is a leader in quiet cooling technology. Its award-winning A-series design, featuring Flow Acceleration Channels and an Advanced Acoustic Optimisation frame, ensures superior airflow with minimal noise. This fan is built for longevity, boasting a MTTF of over 150,000 hours, making it a dependable choice for critical server and networking equipment. Unlike generic fans, Noctua's precision engineering guarantees consistent performance and quiet operation, essential for maintaining optimal conditions in any IT setup. **Ideal for Indian IT Infrastructure** — This fan is perfect for Indian users needing reliable cooling for 1U servers, routers, switches, and NAS devices. Its compact 40x20mm size fits into tight spaces common in home offices or small server racks. The 4-pin PWM control ensures it adapts to varying ambient temperatures found across India, while the low noise output is crucial for quiet working environments. For those seeking dependable performance without disruptive fan noise, this Noctua fan is the superior choice over louder, less specialized alternatives. ## How to use 1. Determine the 40x20mm fan mounting spot on your server, router, NAS, or other device. Ensure adequate clearance for the fan and its cables. — Identify Mounting Location 2. Use the included OmniJoin adaptor set if connecting to a proprietary fan header, or directly plug the 4-pin PWM connector into a compatible motherboard or controller header. — Connect Fan Header 3. Use the provided anti-vibration mounts and fan screws to secure the fan. Connect the extension or y-cable if needed for routing or dual-fan setups. — Secure Fan and Attach Accessories 4. For maximum quietness, connect the Low-Noise Adaptor between the fan and the header to limit speed to 4400 RPM, ideal for noise-sensitive applications. — Optional: Install Low-Noise Adaptor ## Product details | Field | Value | |---|---| | Fan Blades | Noctua's A-series design with Flow Acceleration Channels | | Frame | Advanced Acoustic Optimisation frame | | Voltage | 12V DC | | Power Connector Type | 4-Pin PWM | | Maximum Speed | 5000 RPM (4400 RPM with LNA) | | Maximum Airflow | 9.4 m³/h (33.2 CFM) | | Noise Level | 14.9 dB(A) (12.1 dB(A) with LNA) | | MTTF | >150,000 hours | | Included Accessories | Anti-vibration mounts, fan screws, extension cable, y-cable, OmniJoin adaptor set | | Warranty | 6 years manufacturer’s warranty | | Cost per use | Over 150,000 hours MTTF: ₹0.018 per hour of operation | | Brand | Noctua | | Model Number | NF-A4x20 PWM | | Fan Size | 40x40x20 mm (4cm x 4cm x 2cm) | | Item Dimensions | 4 cm x 4 cm x 2 cm | | Item Package Weight | 0.16 kg | | Material | Fibre-glass reinforced PBT | | Cooling Method | Air | | Compatible Devices | Desktop | | Country of Origin | Not stated by manufacturer — US retail version, sourced from authorized US retailers | ## Frequently asked questions ### Will this Noctua fan fit my server or router? This Noctua NF-A4x20 PWM fan measures 40x40x20mm, making it ideal for compact 1U servers, routers, switches, and NAS devices. It includes an OmniJoin adaptor set for connecting to proprietary fan headers, ensuring compatibility with a wide range of equipment commonly used in Indian IT setups. ### How quiet is this Noctua fan? The Noctua NF-A4x20 PWM fan operates at a maximum of 14.9 dB(A), with an included Low-Noise Adaptor reducing speed to 4400 RPM and further lowering noise to 12.1 dB(A). This makes it exceptionally quiet, suitable for sensitive office or home environments in India where fan noise can be disruptive. ### Does this fan support automatic speed control? Yes, this is a 4-pin PWM fan, allowing your motherboard or system controller to automatically adjust its speed based on temperature. This ensures optimal cooling when needed and quiet operation during lighter loads, adapting efficiently to India's varying ambient temperatures. ### What is the expected lifespan of this fan? The Noctua NF-A4x20 PWM fan is built for extreme durability, boasting a Mean Time To Failure (MTTF) of over 150,000 hours. This exceptional longevity ensures reliable, long-term cooling performance for your critical server and networking equipment, minimizing the need for frequent replacements. ### How to buy an original Noctua fan in India? To ensure you receive an original Noctua NF-A4x20 PWM fan, purchase from CrowCrowCrow. We import directly from authorized US retailers, ensuring factory-sealed products. All customs duties and GST are included in the price, and delivery is tracked via ExpressBox to your Indian pincode. ## Compliance No product-specific compliance warnings identified. Standard imported-goods terms apply: customs duties & GST paid; for personal use in India; follow the manufacturer's usage instructions on the packaging. ## Images 1. https://images.crowcrowcrow.com/B071W93333-0.webp 2. https://images.crowcrowcrow.com/B071W93333-3.webp 3. https://images.crowcrowcrow.com/B071W93333-6.webp 4. https://images.crowcrowcrow.com/B071W93333-9.webp 5. https://images.crowcrowcrow.com/B071W93333-12.webp 6. https://images.crowcrowcrow.com/B071W93333-15.webp --- Source: https://crowcrowcrow.com/p/noctua-nf-a4x20-pwm-quiet-fan-4-pin-40x20mm-brown-2/cfs2653 Returns: 14 days, free pickup, full refund on genuine issues. Shipping: Free across India, 6-8 days. Prices are all-inclusive (duties + GST).