Track Order
Zoom the image with mouse
*Image may vary from the actual product due to change in packaging, casing and design by the brand owner.
Online Support
Have a Specific Query Send us a message
ask Mimo

Product Overview

Noctua NF-A4x20 40mm PWM Fan

Featuring advanced aerodynamic design measures such as Flow Acceleration Channels and Noctua’s AAO frame, the NF-A4x20 is a highly optimized, premium-quality quiet fan in size 40x20mm. The PWM version sports Noctua’s custom-designed NE-FD1 IC for fully automatic speed control via 4-pin fan headers and comes with a Low-Noise Adaptor as well as an 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.

40x20mm size
Compared to Noctua’s award-winning NF-A4x10, 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.

Flow Acceleration ChannelsFlow Acceleration Channel
The 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.

AAO frameAAO frame
Noctua'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.

Stepped Inlet DesignStepped Inlet Design
Noctua'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.

Inner Surface MicrostructuresInner Surface Microstructures
With 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.

Integrated Anti-Vibration PadsIntegrated Anti-Vibration Pads
Integrated Anti-Vibration Pads made from extra-soft silicone minimize the transmission of minute vibrations while maintaining full compatibility with all standard mounting systems and fan clips used on heatsinks.

SSO2 bearingSSO2 bearing
The NF-A4x20 features the further optimized 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 stabilization, precision, and durability.

Custom-designed PWM IC with SCDCustom-designed PWM IC with SCD
Supporting fully automatic PWM speed control, the fan uses Noctua's custom-designed NE-FD1 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.

Stops at 0% PWMStops at 0% PWM
When the fan is set to 0% PWM duty cycle by the motherboard or PWM fan controller, it will stop. This makes it ideal for creating setups with semi-passive cooling that automatically turn the fans off and thus run completely silent at idle if thermals allow.

Low-Noise AdaptorLow-Noise Adaptor
The NF-A4x20 PWM is supplied with an (L.N.A.) that reduces the maximum fan speed from 5000 to 4400rpm. The L.N.A. can be used either to run the fan at a fixed speed of 4400rpm or to cap the maximum speed when using automatic PWM control.

OmniJoin™ adaptor setOmniJoin™ adaptor set
Many 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 into proprietary fan headers.

Extensive cabling options extensive cabling options
The fan's short 20cm primary cable minimizes 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.

6-year manufacturer warranty6-year manufacturer’s warranty
Noctua 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.

Features

• 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, and OmniJoin adaptor set for connecting the fan to proprietary fan headers

Shipping & Returns – RMA

TECHMIMO promises to always deliver high quality products at competitive prices. Our mission is to gain 100% customer satisfaction. However, in rare cases if you aren't satisfied with any of our products received then you can apply for an RMA (Return Material Authorization) which is subject to our terms and conditions below. At the time of placing an order the purchaser is required and assumed to agree to these terms and conditions.

Definitions

“We” or “Us” or “Our” means TECHMIMO and any authorized person acting on behalf of TECHMIMO.

“You” or “Customer “can be one of the following:

A "Business Customer" which means a customer or consumer acting on behalf of an actively trading business entity.

A "Consumer" which means an individual generally the end-consumer who is not acting on behalf of a business entity.

Non-Faulty Items Returns Policy
  • We only accept RMA requests from you who originally purchased them and cannot accept return requests from a third party on your behalf.
  • You must inform us in writing within 14days after receiving the item(s) if you wish to return all or part of the original order that are considered non-faulty. Any RMA requests for non-faulty item(s) received after this period will not be considered.
  • We only accept returned items that are in-saleable condition.
  • Saleable condition is defined as meeting the same standards as newly manufactured/sourced products and still have manufacturer’s seal fully intact and are unopened and in the original packaging with all the instructions, warnings etc. TECHMIMO reserves the right to determine salability of a product.
  • You must inform us of any faulty items in writing within 14 days from the date of item(s) received by you. In case of incomplete or damaged products, we must be informed within seven (7) days of you receiving the item. In some cases, we may consider items returned after 14 days if it can be proven that the item(s) was/were faulty when delivered and did not develop fault due to customer misuse, not following manufacturer’s instructions or damaged by the customer.
  • In case of wrong power supply or voltage being used by the customer no return is acceptable.
  • In case of incomplete/damaged goods received by the customer, the sales team will try to replace the order, however, this is subject to further stock being available. We will try our best to rectify the problem within thirty (30) days. If the problem cannot be rectified within this time-frame, then customer will post the item(s) back to the address indicated on the RMA to claim any refunds. Proof of return postage must always be kept to certify return and ensure the correct claim for shipping cost can be made.
  • No re-stocking or shipping fees will be paid by the customer in case of a successful faulty/Incomplete/Damaged item return.
  • We will normally issue a full refund to the customer within 14 days from the date the item is received at our warehouse.
Fees – Non-Faulty Items:
  • TECHMIMO will impose a £30 on product value of £150, and on above £150 value product, 25% restocking will be applied, unless the return is proven to be due to an error on our part such as we shipped the wrong part etc.
  • If the initial payment for the order was made using a credit card then a 3% fee may also apply.
  • For international orders, all import charges and/or custom fees will be charged to you where these apply. These will be communicated to you (if applicable) after we receive the RMA request.
  • All return postage (a proof of postage must be obtained and is required by us to process any refunds) will be paid by the customer.
Subject to all of the above, we will issue any refund due to the customer within 14 days from the date the item is received at our warehouse.
    Faulty Items Returns Policy
    • We only accept RMA requests from you who originally purchased them and cannot accept returns from a third party on your behalf.
    • You must inform us of any faulty items in writing within 14 days from the date of item(s) received by you. In some cases, we may consider items returned after 14 days if it can be proven that the item(s) was/were faulty when delivered and did not develop fault due to customer misuse, not following manufacturer’s instructions or damaged by the customer.
    • Upon receiving RMA for faulty item(s), our technical team will investigate and offer help via phone and/or remote access to rectify any problems. However, if the fault remains and cannot be rectified then the customer would need to post the item(s) back to us (proof of postage must be obtained and is required by us to process any refunds).
    • In case of wrong power supply or voltage is used then no return is acceptable.
    • No fees will be paid by the customer in case of a successful faulty item return.
    • We will normally issue a full refund to the customer within 14 days from the date the item is received at our warehouse.
    Procedure for Returning Products

    Products that are returned to TECHMIMO require a Return Material Authorization (RMA) which can be requested from our Customer Service department or by emailing a written request to sales@techmimo.co.uk

    The following information will be required to issue the RMA:

    1. TECHMIMO invoice number & Customer P.O. number or Delivery reference number
    2. Date of purchase
    3. Part number / description / quantity (if items were purchased in pack quantities then only full pack quantities will be accepted for return)
    4. Reason for the return.
    Shipping returns to TECHMIMO with an RMA
    • Products authorized to be returned on the RMA will be need to be posted to the return address as indicated on the RMA.
    • TECHMIMO should receive returned product(s) within 14 days after issuing the RMA. Items received after this period will void the original RMA.
    • If we are organizing the transportation of the products to be returned, instructions will be provided by Customer Service to organize collection of the products to be returned by a carrier selected by us.

    Inspection of returns at TECHMIMO

    Unless faulty, only the returned item(s) received in salable condition, will be considered for return and credit. At arrival of the return products, we will determine whether returned products are in a sell able condition.

    Products received in a non-salable condition will be handled in one of the following ways:

    • Refurbishment of the products returned – TECHMIMO will determine refurbishment costs and inform Customer Service
    • Destruction with Customer approval, including any applicable scrapping charges.
    • Return of the product to the customer, including any applicable transportation charges

    Noctua NF-A4x20 40mm PWM Fan

    Noctua
    NF-A4x20 PWM
    Many in stock
    Components
    £20.38
    40mm Noctua NF-A4x20 PWM 40mm x 20mm 4-pin Fan
    £20.38

    Product is New

    Product Condition

    New
    A brand-new, unused, unopened and undamaged item in original retail packaging


    Used
    An item that has been previously used. The item may have some signs of cosmetic wear, but is fully operational and functions as intended. This item may be a floor model or an item that has been returned to the seller after a period of use. See the seller's listing for full details and description of any imperfections.

    Free Shipping

    Free standard shipping on orders over $99

    Estimated to be delivered on 12/01/2022 - 15/10/2022.

    Shipping

    We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.

    When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

    Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

    Noctua NF-A4x20 40mm PWM Fan
    You have successfully subscribed!
    This email has been registered