Dual 140 mm Fan to 160 mm Metric Duct Shroud

Description

Dual 140 mm fan to 160 mm metric duct shroud

If you run a 140 mm fan machine on metric duct, 160 mm is usually the size that suits it. The dual-140 generation is the high-power end of air-cooled mining, it puts a lot of hot air into a pipe, and 160 mm gives that air noticeably more room than the 150 mm domestic size without demanding the space and cost of a 200 mm run. This shroud captures both 140 mm exhaust fans and converges them into a single 160 mm collar.

No imperial collar can do this. Six inches is 152.4 mm and eight is 203.2 mm, so 160 mm falls squarely in the gap between them, which is why an inch-sized shroud plus an adapter is the usual compromise. Cutting the collar at 160 mm from the start removes the adapter and the extra joint that comes with it.

The fan side is drawn to the 140 mm face: 140.0 mm pitch, 134.0 mm bore per fan, 3.0 mm sealing land per side, in one PETG body.

What it fits: dual 140 mm exhaust, 160 mm metric duct

Miners with two 140 mm exhaust fans on a 140.0 mm pitch, exhausting into 160 mm metric flex duct. The dual-140 face is what defines it, so it covers the S21 Pro and S21+ class and anything else built the same way.

Neighbouring sizes in the same family: the dual 140 mm to 150 mm shroud for domestic metric hose, and the dual 140 mm to 200 mm shroud for the largest metric runs. On imperial fittings, the universal dual 140 mm to 8-inch shroud. If your machine runs 120 mm fans, you want the dual 120 mm to 160 mm version.

How it installs

1. Line the flange up over both 140 mm exhaust fans on the fan screw pattern.
2. Screw through the 5.0 mm holes and 5.424 mm slots, using the miner’s own large-head fan screws or your own with a 9 mm or larger flat washer.
3. Slide 160 mm metric flex duct over the collar and past the 160.0 mm crest.
4. Clamp onto the 158.0 mm sealing land.
5. Support the duct near the shroud if it is insulated or runs vertically, then route it out.

Why this size suits a dual-140 machine

Two effects stack up in favour of the larger collar. First, wall friction: a wider pipe has less wetted perimeter per unit of flow area, so a long run costs less pressure. Second, velocity: the same volume of air through a bigger hole travels slower, and air noise in ducting climbs steeply with speed. A dual-140 machine is producing enough air that both effects are worth having, and 160 mm buys them without the bulk of a 200 mm run behind the miner.

Inside the body the two 140 mm columns merge before the transition to round begins, so the collar receives one stream.

• Reaches 160 mm exactly, a size that falls between 6-inch and 8-inch fittings.
• Deletes the reducer or adapter a metric run otherwise needs at the machine.
• Cut for the dual-140 face: 140.0 mm pitch, 134.0 mm bore, 3.0 mm sealing land per fan.
• Lowers duct velocity relative to a 150 mm run, which is the quiet direction to move in.
• Keeps 8.69 mm of driver clearance at the tightest fan screw.
• Single-piece PETG, so there is no bonded seam across the transition.

Specifications

Open source: our drawing, your printer if you want it

This shroud is D-Central Technologies’ own design — we drew it around the dual-140 exhaust face and open-sourced it ourselves — published under CC BY-SA 4.0 at the 3D models download center, with its card at the dual 140 mm to 160 mm entry and the file at the dual-140 to 160 mm shroud bundle: STL, CC BY-SA 4.0 licence, installation and safety guide. Download it, change the collar, print a dozen, sell them. We would rather the design spread than sit behind a paywall while people tape hose to funnels.

Ordering here gets the finished part instead: PETG, black or orange, made to order in Montreal, Quebec and shipped from Canada. The download never becomes conditional — buying the printed shroud, or backing us at the D-Central fund page, is what pays for the collar sizes still on the list.

Works with

• Dual 140 mm Fan to 150 mm Metric Duct Shroud
• Dual 140 mm Fan to 200 mm Metric Duct Shroud
• Universal Dual 140 mm to 8″ Duct Shroud
• Antminer S19 / S21 Dual 120 mm to 160 mm Metric Duct Shroud
• 140 mm Intake Filter Ring

The rest of the metric line is in the D-Central shroud and ducting system.

Frequently asked questions