Martech 12V 5A 7000RPM Cooling Fan for Antminer S21 Pro & S21+ Crypto Miner

Name: Martech 12V 5A 7000RPM Cooling Fan for Antminer S21 Pro & S21+ Crypto Miner
Brand: LYS Shenzhen
Price: 14.9 USD
Availability: InStock

$14.90 USD

Sale Sold out

Shipping calculated at checkout.

🇺🇸🇪🇺 USA & European Union: DDP shipping — all import duties & taxes included, no hidden fees.

🌍 Rest of world: Ships from China — local customs fees may apply on delivery.

Get Business Pricing

Product variants

Quantity

Secure checkout

SSL encryption & invoicing options

Worldwide shipping

Export-ready customs documentation

QC-tested spare parts

Specialized in ASIC miner hardware

Technical support

Assistance from mining engineers

Have questions about this product? Our team is here to help — just reach out on WhatsApp.

💬 Contact Us on WhatsApp

About the Product

Martech DF1403812B2FN – 140 × 140 × 38 mm 7000 RPM Cooling Fan for Antminer S21 Pro / S21+

The Martech DF1403812B2FN is the 140 × 140 × 38 mm high-speed cooling fan fitted to Antminer S21 Pro and S21+ chassis. Running at 12 V 5 A and 7000 RPM on maintenance-free double-ball bearings, it delivers the airflow needed to keep dense S21-class hashboards within thermal spec under continuous load. A tired or noisy fan on an S21 Pro is one of the most common reasons for thermal-throttling or a stalled-rotor fault — a genuine Martech replacement restores rated hashrate without firmware changes.

DF1403812B2FN Fan Specifications

Feature	Specification
Brand	Martech
Model	DF1403812B2FN
Size	140 × 140 × 38 mm
Voltage	12 V DC
Current	5 A
Speed	7000 RPM
Bearing Type	Double ball bearings (maintenance-free)
Connector	Square 4-pin 5557
Compatibility	Antminer S21 Pro, S21+
Condition	Brand New

When to Replace the S21 Pro Fan

Classic signs: the miner log shows a fan alarm or "fan fault"; the chassis buzzes, ticks or chirps; a rotor that spins freely but never reaches rated RPM; or rising hashboard temperatures with no change in ambient. Double-ball-bearing fans are the right choice for 24 / 7 operation — they outlast sleeve-bearing alternatives in continuous farm duty.

Installation Notes

Power the miner off and unplug mains before opening the chassis. Match the airflow arrow on the replacement to the original fan direction so hashboards keep their intended intake / exhaust pattern. Seat the 4-pin 5557 connector firmly with the latch engaged so the controller can read RPM and tach feedback — otherwise the firmware will trip a fan-fault boot error regardless of actual rotor state.

Related 14 cm High-Speed Miner Cooling Fans

Keep S21 Pro and S21+ miners at rated hashrate with a genuine Martech DF1403812B2FN. Order online or contact us at contact@lys-sz.com for carton-quantity pricing. Worldwide shipping from our Shenzhen warehouse.

Shipping & Customs

🇺🇸🇪🇺 USA & European Union (DDP):
Orders are delivered DDP (Delivered Duty Paid). All customs duties, import taxes, and fees are included — no additional charges on delivery.

🌍 Rest of world:
Orders ship from China. Depending on your country, local customs authorities may apply import duties or taxes. Any such fees are set by your local authorities and are not included in the product price.

View Product Details

ASIC TEST FIXTURE

K9 Multifunctional Hashboard & Power Supply Tester

Save up to 25% with the current price

Shop now

LYS-SZ.com provides shipping services from China to worldwide through our agents and offices

WORLDWIDE EXPRESS SHIPPING

LYS-SZ.com offers reliable shipping and logistics solutions worldwide. We have strong partnerships with leading carriers like DHL, FedEx, and UPS, ensuring timely, efficient and tracked transportation of your goods.