Universal Dual 140 mm to 8″ Duct Shroud

Description

Dual 140 mm fan to 8-inch duct adapter shroud

Two 140 mm fans on one exhaust face is the highest-airflow layout in common use on mining hardware. This dual 140 mm fan to 8-inch duct adapter is the version that hands all of it a full-width exit instead of choking it at the very first fitting.

Like its 6-inch sibling, the body is keyed to the fan flanges rather than to a particular chassis, so it covers hardware generations, bench rebuilds and fan-converted machines from a single design. Where it differs is everything downstream of the plenum: a 203.2 mm collar with roughly 1.8 times the area of a 6-inch round.

One continuous PETG body, drawn in-house, nothing to assemble.

What it fits: dual 140 mm faces, 8-inch runs

Dimensioned to a pair of standard 140 × 140 mm fan flanges on a shared exhaust face, with a standard 8-inch collar on the outlet. That collar is what makes it the trunk-line member of the family: it mates with 8-inch inline fans, 8-inch couplers and 8-inch window ports without an adapter in between.

For a compact install in a tight rack, the Universal Dual 140 mm to 6″ Duct Shroud is the smaller body, at 300 x 175 x 160 mm. If you already know your machine is an S21 Pro, the dedicated S21 Pro body sits closer to that chassis. On metric ducting, take the 200 mm metric version.

How it installs

1. Drop the body over both 140 mm fan frames so they seat inside the plenum mouth.
2. Clamp 8-inch duct, or an 8-inch inline fan flange, directly to the collar.
3. Allow 300 mm of width and 203.2 mm at the collar end behind the machine.
4. If several machines share a trunk, join them with a Y-splitter rather than tees.

Why the trunk-sized outlet changes the install

Once a duct run is long enough to need an inline fan, a splitter or a filter, the fittings themselves start to dominate the resistance. Starting the run at 8 inches means every one of those fittings can be an 8-inch fitting, with no step change at the machine and no reducer sitting where the air is moving fastest. If you do need to neck down, do it at the far end where the losses cost least.

The fan side is unchanged from the 6-inch body: both 140 mm columns merge in a shared plenum, then the section rounds off in one continuous curve to the collar. Two flows settling together before the transition is worth more than any amount of collar polish afterwards.

• Matches the highest-airflow fan layout to the widest collar in the imperial line
• Fits by fan pattern, covering a wide range of hardware from one body
• Mates directly with 8-inch inline fans, couplers and window ports
• Feeds a shared trunk cleanly through an 8-inch to dual 6-inch splitter
• PETG body that keeps its shape where exhaust heat softens PLA
• One piece from fan face to collar — no joint to seal, nothing to fasten

Specifications

Open source: take the file, or take the finished part

Every body in this line is D-Central’s own drawing, and every one of them is published under CC BY-SA 4.0 at the 3D models download center: download it, change the collar, widen the fan spacing, run it commercially. We release our work because a ducting standard is only useful if everybody can build to it.

For this body specifically: the model card, or the ZIP with the STL, the CC BY-SA 4.0 licence and the installation and safety guide. D-Central Technologies is the author of all of it.

Buying here gets you the finished body, made to order in black or orange PETG and shipped from Montreal, Quebec, with the current revision of the geometry rather than whatever was drawn a year ago. The file is free permanently; the order, or D-Central’s fund page, is what pays for the next one.

Works with

• Universal Dual 140 mm to 6″ Duct Shroud
• 8″ to Dual 6″ Y-Splitter
• 8″ Duct Coupler
• 140 mm Intake Filter Ring
• 8-Inch Flex Duct Window Vent Port

Plan the whole run from the D-Central shroud and ducting system page.

Frequently asked questions