Martech 12V 5A 7000RPM Cooling Fan for Antminer S21 Pro & S21+ Crypto Miner
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Martech DF1403812B2FN 140mm 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 12V / 5A / 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. Drop-in replacement when the original fan dies or starts squealing.
When to Replace the DF1403812B2FN
- Audible bearing failure — squealing, grinding, or rattling indicates worn bearing.
- Thermal throttling — S21 Pro reducing hashrate due to insufficient cooling airflow.
- Stalled-rotor fault — miner reports fan-fail / stalled rotor on boot or under load.
- Pre-emptive maintenance — replacing aging fans before failure during scheduled service.
- Fleet sustainment — S21 Pro fleet operators stocking fan spares.
Martech DF1403812B2FN Specifications
| Feature | Specification |
|---|---|
| Brand | Martech |
| Model | DF1403812B2FN |
| Size | 140 × 140 × 38 mm |
| Voltage | 12V DC |
| Current | 5A |
| Speed | 7000 RPM (high-speed) |
| Bearing | Double ball bearing (maintenance-free) |
| Compatible Miners | Antminer S21 Pro / S21+ |
| Condition | Brand New |
FAQ — Martech DF1403812B2FN Fan
Q: Will it fit other S21 variants (S21 / S21 XP / T21)?
A: The 140 × 140 × 38 mm form factor is standard across many S21-class chassis. The S21 Pro / S21+ use this specific high-RPM Martech variant. Other S21 variants may use different fan part numbers — verify against your existing fan model before ordering.
Q: Generic 140mm fan substitution OK?
A: Generic 140 × 140 × 38 mm 12V fans may physically fit but RPM and acoustic profile differ. The OEM Martech preserves S21 Pro's thermal envelope and noise profile. For best results, stick with OEM-spec.
Q: How often should I replace the fan?
A: Double ball-bearing fans typically last 50,000-100,000 hours of 24/7 operation — 5.7-11 years. For mining utilization, plan replacement at first sign of bearing noise or every 3-5 years pre-emptively for high-availability deployments.
Q: Bulk pricing for S21 Pro fleet operators?
A: Yes — email contact@lys-sz.com with your fleet size for tier pricing on multi-fan orders.
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S21 Pro fleet operators stocking Martech fans by the case? Email contact@lys-sz.com for bulk pricing. Worldwide shipping from our Shenzhen warehouses.
Buying in bulk for a mining farm or repair shop?
Get dedicated B2B pricing on this part and across our full catalog — quote response within 24 hours, payment by T/T USD bank wire, and DDP delivery available for US & EU customers (and other lanes on request).
