The complete set for your Antminer S21+, S21 Pro or S21 XP – intake, exhaust and all adapters in one box. Two use cases with one set: Either with stock fans for duct connections on both sides, or without fans for external cooling with an inline fan. You don't need to decide beforehand – all parts for both setups are included.
At a Glance
Contents: 1× intake shroud, 1× exhaust shroud, 2× intake adapter (short + long), 1× exhaust adapter, 2× screw set (16 screws each), 2× hose clamp
Size options: 8 inch (200mm) or 10 inch (250mm)
Use case 1: With stock fans – long intake adapter + exhaust adapter, ducts on both sides
Use case 2: Without fans – short intake adapter for inline fan, no exhaust adapter needed
Option 1: With Stock Fans
The fans stay in the miner. On the intake side, the shroud with the long intake adapter mounts over the fan and supplies fresh air via duct hose. On the exhaust side, the shroud with the exhaust adapter captures all the heat and directs everything into one hose. This way 100% of the heat goes exactly where you want it.
Option 2: External Cooling
The stock fans are removed entirely. On the intake side, the short intake adapter is mounted – a quiet inline fan connects directly. On the exhaust side, the shroud ducts the hot air away through a hose – no exhaust adapter needed. The result: significantly less noise with equal or better cooling performance. Additionally required: inline fan. Fan spoofer only needed with stock firmware (Bitmain OS) – not required with Braiins OS or other alternative firmware.
8 or 10 Inch?
Both sizes fit the same miner – the difference is in duct diameter. 10 inch offers less air resistance and is generally the quieter option: Whether stock fans or inline fan – the fans have less backpressure to work against and run quieter as a result. Ideal for longer duct runs or bends. 8 inch is sufficient for short, straight runs and is more compact.
Compatible Miners
Fits all Antminer models with 2× 140mm fans: S21+, S21 Pro, S21 XP, S23.
Not compatible with S19 series and base S21 (different fan size, 120mm) – for those, check our S19/S21 Universal Set.
Material and Quality
Made from PETG – heat-resistant, durable, and printed as solid material. Designed and manufactured in Germany.
Frequently Asked Questions
What's the difference from the regular 2-piece set?
The regular 2-piece set includes two identical shrouds for duct connections. This universal set additionally includes intake and exhaust adapters that enable external inline fan cooling – for significantly quieter operation.
Do I need a fan spoofer?
Only for option 2 (external cooling) and only with the original Bitmain firmware. Stock OS reports an error when no fans are detected – a fan spoofer emulates the PWM signal to prevent this. If you're running alternative firmware like Braiins OS, no spoofer is needed. For option 1 (with stock fans) none is required either way.
Which duct hose do I need?
Two flexible aluminum duct hoses matching your chosen size – one for intake, one for exhaust. Available in our hose selection or at your local hardware store.
Installation guide available?
Yes – an illustrated guide for both setup options is available on our instructions page.