Whatsminer 140 mm Fan to 6″ Duct Shroud

Description

Whatsminer shroud: the full 140 mm fan face into 6-inch duct

This Whatsminer shroud is a 140 mm fan to 6-inch duct adapter, and it exists because most of the market is the wrong size. MicroBT builds the M-series around 140 mm fans, while almost every shroud sold anywhere is drawn for the 120 mm fans Bitmain uses — leaving the outer band of a Whatsminer’s blade blowing at the back of a plate.

D-Central drew this one to the 140 mm fan flange itself, not to one generation’s chassis wrap, so a single body covers the M30S+, the M50, the M50S+ and the M60 instead of one model year. One continuous PETG body: no seams to leak, no glued joints, no fasteners to back out.

What it buys you is control. An unducted Whatsminer decides for itself where its heat and noise go, and the answer is always the whole room. Put a collar on the exhaust and the machine becomes something you can place on purpose.

What it fits: MicroBT Whatsminer M-series 140 mm fans

Built to the Whatsminer 140 mm fan flange on its 124.5 mm screw pattern, with slotted 4.5 × 5.3 mm holes that span the 124.5 and 125.0 mm pitch split. The machines that carry that face are the M30S+, the M50, the M50S+ and the M60. MicroBT changes the case far more often than the fan, so a fan-referenced duct adapter survives a fleet upgrade — but it is those four models this shroud is cut for, not the M-series as a slogan.

The outlet is a standard 6-inch collar at 152.4 mm nominal, taking common flexible or rigid duct and 6-inch inline fans.

If your duct is metric, take the collar that matches it: the Whatsminer 140 mm Fan to 150 mm Metric Duct Shroud, the 160 mm version, or the 200 mm version. Two 140 mm fans on one exhaust face, as on an Antminer S21 Pro, want the Antminer S21 Pro Dual 140 mm to 6″ Duct Shroud. A 120 mm machine belongs on the Universal Single 120 mm Fan to 6″ Duct Shroud.

How it installs

1. Seat the shroud over the exhaust fan, square to the 140 mm flange.
2. Slide 6-inch flexible or rigid duct over the collar and band-clamp it down.
3. Run the duct out: window port, wall penetration, or into a 6-inch inline fan.
4. If the machine lives somewhere dusty, add a 140 mm Intake Filter Ring on the cold end.

Why a 140 mm shroud is not a 120 mm shroud with a bigger hole

A 140 mm fan sweeps roughly 36 percent more disc area than a 120 mm one. That extra area sits at the outside of the blade, the part moving fastest, because tip speed climbs with radius. Push a 140 mm fan through a body drawn for a 120 mm face and it is that outer ring you block: the air recirculates behind the plate and comes back at the fan as noise and heat that never reached the duct.

This body opens at the full 140 mm face and keeps its walls moving outward to the 6-inch collar, so the transition is an expansion rather than a step, with 125 mm of depth to make it gradually.

• Opens at the full 140 mm fan face — no blocked outer ring, no recirculation behind a plate
• References the M-series fan flange, so it survives a chassis generation change
• Lands on a standard 6-inch collar that ordinary duct and inline fans already fit
• Holds its geometry in sustained exhaust heat — PETG, not a low-temperature plastic

Specifications

Open source — Whatsminer owners should not have to hunt for files

The 140 mm corner of this hobby has been starved of parts for years. D-Central’s answer is to design properly and give the design away: released under CC BY-SA 4.0 at the 3D models download center, free to download, modify, remix, print and sell.

D-Central Technologies designed this shroud, drew the 154 mm flange and the 6-inch collar, and open-sourced the result. It is our file. The model card is at the Whatsminer 140 to 6-inch entry and the download is whatsminer_140_to_6in.zip: STL, CC BY-SA 4.0 licence, installation and safety guide.

This listing is the finished article — printed to order in PETG in Montreal, Quebec and shipped worldwide from Canada, so a Whatsminer owner without a printer is not locked out. It comes in black or in orange. The file stays free; buying the printed part or backing D-Central’s fund page is what pays for the rest of the 140 mm range.

Works with

• Whatsminer 140 mm Fan to 8″ Duct Shroud — wider collar, longer runs
• Whatsminer 140 mm Fan to 150 mm Metric Duct Shroud — metric ducting
• Whatsminer 140 mm to 8″ Expansion-Chamber Shroud Silencer
• 140 mm Intake Filter Ring — dust control, cold end
• Bayonet Duct Receiver 6-Inch

See the full D-Central shroud and ducting system for the compatibility matrix and sizing guide.

Frequently asked questions