Whatsminer 140 mm Fan to 150 mm Metric Duct Shroud

Description

Overview

Air-cooled Whatsminer M-series machines exhaust through a single 140 mm fan, and this shroud takes that fan straight into 150 mm metric duct — the size K19 Rohrventilator class inline fans use. If your ducting is metric, an inch collar will not fit it: 6 inches is 152.4 mm, not 150.

The fan side uses the Whatsminer-specific 135.0 mm bore, a value taken from exact CAD of the Whatsminer fan rather than the generic 140 mm figure. Single-piece PETG, flex-over collar: the duct slips over and clamps on the 148.0 mm sealing land.

What it fits

Air-cooled Whatsminer M-series miners with a single 140 mm exhaust fan, exhausting into 150 mm metric duct.

Measure before you order. Fit dimensions in this line are derived from published fan and chassis geometry and are not yet validated against measured production hardware. Check your flange size and clearances against the footprint below. If something does not fit, tell us — that is how the next revision gets better.

One more honest number: the collar’s sealing land sits at duct nominal minus 2.0 mm, while measured male metric hardware runs nominal minus 1 to minus 2 mm. Our land sits at or under that hardware and never over — which is a retention argument, not an exact-match claim. The metric ring coupon measurement that would settle it is still open.

A note on corroboration: the 150 mm sizing rests on manufacturer datasheet evidence only, so it has weaker backing than the 160 mm and 200 mm sizes in this line. Do not treat it as verified against physical spigots — it is not, yet.

How it is used

Mount the shroud over the single 140 mm exhaust fan using the fan screw pattern. The flange holes are 5.0 mm (with 5.424 mm slots); put a 9 mm or larger flat washer under each screw head, or reuse the miner’s own large-head fan screws. Then slip 150 mm metric flex duct over the collar, clamp it on the sealing land behind the crest, and route the duct to a window port, a plenum, or the space you want to heat.

Why it helps

• Whatsminer-specific fan geometry: 135.0 mm bore from exact CAD, not a generic figure.
• Pairs the Whatsminer with K19 Rohrventilator class 150 mm metric ducting.
• Single-piece PETG part: no seams, no glue joints, nothing to work loose over months of fan vibration.
• Every fan screw stays reachable: minimum measured tool radius 11.53 mm on this part, against a project target of 8.0 mm — all screws rate GOOD.

Specifications

Open source

This design is open source under CC BY-SA 4.0. The files are free at /3d-models/, and anyone may print, modify or sell them. Buying the finished part supports the work that produces these designs — you can also support it directly via the fund.

Works with

• Whatsminer 140 mm to 6-inch duct shroud
• Whatsminer 140 mm to 160 mm metric duct shroud

See the full D-Central shroud and ducting system.

Frequently asked questions