You save 3,492 (36%)
36% off the seller list price
Doorstep delivery by 25 Oct - 27 Oct from USA
Upgrade Your Network Gear Cooling
Noctua NF-A4x20 FLX fans are engineered for superior quiet cooling in compact 1U applications and network equipment. This 2-pack provides flexibility for routers, switches, NAS, and DVRs, delivering up to 5000 RPM with a maximum of 14.9 dB(A) noise. The 3-pin FLX version includes Low-Noise Adaptors for fine-tuning speed and airflow, ensuring optimal performance for your Indian setup.
Featuring Noctua's award-winning A-series design with Flow Acceleration Channels and Advanced Acoustic Optimisation frame, these fans move significant air while maintaining near-silent operation. Constructed from durable fiber-glass reinforced PBT material, they boast a MTTF of over 150,000 hours, promising long-term reliability. The 40x20mm size is ideal for tight spaces where standard fans won't fit.
Imported directly from authorized US retailers, these fans ensure authentic performance. All customs duties and GST are pre-paid, with ExpressBox tracked delivery to your Indian pincode. While local alternatives may offer basic cooling, Noctua's precision engineering provides a significant upgrade in quiet efficiency and longevity for your critical network and storage devices.
Engineered for Silent, Powerful Cooling
Noctua's A-series fans are renowned for their exceptional quietness and airflow. The NF-A4x20 FLX utilizes Flow Acceleration Channels and an Advanced Acoustic Optimisation frame to maximize cooling efficiency without excessive noise. This precision engineering ensures your network equipment and servers run optimally, even under heavy loads. Imported directly, these fans offer a significant upgrade over generic cooling solutions, backed by a 6-year manufacturer's warranty.
Ideal for Network Gear, Who Should Consider Alternatives
These 40x20mm fans are perfect for 1U servers, routers, switches, NAS devices, and DVRs needing quiet, reliable cooling. If you require a larger fan size for a standard ATX PC case or need PWM control via a 4-pin header, consider Noctua's larger fan models. For basic, non-critical cooling in non-noise-sensitive environments, less specialized fans might suffice, but they won't match Noctua's quiet performance and longevity.
Typical situations where Noctua NF-A4x20 FLX 40x20mm Fan (Pack of 2) | Premium Quiet Cooling Components helps — illustrative scenarios, not customer reviews.
A home user in a humid Indian city needs to cool their home router and NAS without adding significant noise.
The Noctua NF-A4x20 FLX 2-pack provides quiet, reliable cooling. Install one fan on the NAS and another on the router. Their low noise output (max 14.9 dB(A)) ensures they won't disturb the living space, while the 5000 RPM speed keeps devices cool even in high ambient temperatures.
A small business owner in India needs to upgrade cooling in a 1U server rack for network switches, prioritizing quiet operation and reliability.
This 2-pack of Noctua fans is perfect for 1U server racks. Their compact 40x20mm size fits tight spaces, and the option to use Low-Noise Adaptors ensures minimal noise disruption in an office environment. The >150,000h MTTF and 6-year warranty offer peace of mind for critical business equipment.
| Speed Settings | 5000 RPM (with LNA), 4400 RPM (with LNA), 3700 RPM (standard) |
| Max. Airflow | 23.4 m³/h (with LNA), 19.8 m³/h (with LNA), 15.9 m³/h (standard) |
| Max. Static Pressure | 2.97 mmH₂O (with LNA), 2.44 mmH₂O (with LNA), 1.93 mmH₂O (standard) |
| Max. Noise Level | 14.9 dB(A) (standard), lower with LNA |
| MTTF | >150,000 hours |
| Warranty | 6 years manufacturer’s warranty |
| Cost per use | 2 fans at ₹6,181 — ₹3,091 per fan |
| Shelf life after opening | Not applicable |
| Reapplication math | Not applicable |
| Contraindications | Requires 3-pin header; not compatible with standard 4-pin PWM fan controllers without adapter. |
| Allergens / common irritants | None listed |
| Feature | Noctua NF-A4x20 FLX | Others |
|---|---|---|
| Fan Size & Type | 40x40x20mm, 3-pin, quiet airflow | Varies by brand; often larger 80-120mm fans, some with 4-pin PWM, noise levels can be higher. |
| Noise Level | Max 14.9 dB(A) (standard), quieter with LNA | Typically 20-30+ dB(A) for similar airflow, often noticeable in quiet rooms. |
| Performance & Longevity | Award-winning design, >150,000h MTTF, 6-year warranty | Varies greatly; many lack specific MTTF ratings or extended warranties. |
| Included Accessories | Low-Noise Adaptors, mounts, screws, OmniJoin adaptor set | Often includes only basic mounting screws; specialized adaptors are rare. |
| Cost per unit | 2 fans at ₹6,181 — ₹3,091 per fan | Local 40mm fans can range from ₹300-₹800 each, depending on brand and features. |
| SKU | emy9609 |
| Brand | Noctua |
| Model Number | NF-A4x20 FLX |
| Fan Size | 40x40x20 mm |
| Pack Quantity | 2 |
| Material | Fiber-glass reinforced PBT |
| Power Connector | 3-pin Molex |
| Voltage | 12V |
| Weight | 180 g (per fan) |
| Dimensions (per fan) | 40 x 40 x 20 mm |
| Package Dimensions | 15.2 x 20.9 x 3.6 cm |
| Package Weight | 0.34 kg |
| Country of Origin | Not stated by manufacturer — US retail version, sourced from authorized US retailers and authorized brand partners |
About Noctua
Noctua is globally recognized for premium, high-performance cooling solutions, specializing in quiet fans and heatsinks for PCs and servers.
Compliance & Legal
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.
Share your experience
Bought this from CrowCrowCrow? Other buyers want to hear how it went.
This item:
Noctua NF-A4x20 FLX 40x20mm Fan (Pack of 2) | Premium Quiet Cooling Components
6,181
This item
Noctua NF-A4x20 FLX 40x20mm Fan (Pack of 2) | Premium Quiet Cooling Components
6,181
Total price:
12,785
You save 6,049 (32%) Extra3 items selected
3 items
12,785You save 6,049 (32%) Extra
| Attributes |  |  | |||||
|---|---|---|---|---|---|---|---|
| Spec | |||||||
| Price | 6,181 9,673 | 3,672 4,901 | 2,932 4,260 | 3,110 4,877 | 2,258 3,271 | 1,435 2,039 | 1,541 1,630 |
| Rating | 4.80(2,518) | 4.88(8) | 4.70(5,903) | 4.80(2,067) | 4.88(8) | 4.40(247) | 4.30(1,504) |
| Brand Name | Noctua | AC Infinity | AC Infinity | Noctua | Thermalright | TYHJ | Saipomor |
| Source | US Retail | US Retail | US Retail | US Retail | US Retail | US Retail | US Retail |
| Sold By | CrowCrowCrow | CrowCrowCrow | CrowCrowCrow | CrowCrowCrow | CrowCrowCrow | CrowCrowCrow | CrowCrowCrow |
Why shop with us
One price. One payment. No surprises.
High risk
Buying Direct
Crowcrowcrow
Safe Lane
