6″ Duct Coupler

Description

Overview

The most boring part in the catalogue and the one people need most often. Joins two lengths of 6-inch duct end to end, with a centre stop so both sides seat to the same depth and a barrel long enough to actually clamp.

What it fits

Standard 6-inch duct on both ends, flexible or rigid. Matches every 6-inch collar in our line, so it also works as a straight extension between a shroud and an elbow, or between two fittings that would otherwise not reach.

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 the clearance around your machine against the footprint in the specifications below. If something does not fit, tell us — that is how the next revision gets better.

How it is used

Slide a duct onto each end until it hits the centre stop, clamp both sides, done. Use it to join offcuts, to extend a run that came up short, to repair a torn section without replacing the whole length, or to make a fitting removable at a convenient point in the run.

Why it helps

Duct runs are never the length you estimated. Being able to join two pieces properly — with a real barrel and a positive stop, rather than a wrap of foil tape — is what stops a run degrading over time as joints work loose and start leaking hot air back into the room you were trying to keep cool.

• Centre stop so both ducts seat to equal depth
• Barrel long enough to take a band clamp on each side
• Doubles as a straight extension between fittings
• Single continuous body, no assembly

Specifications

Open source — print it yourself, or buy it finished

Every shroud D-Central designs is released as an open file. The geometry for this part is free to download from our 3D models download center: use it, modify it, remix it, run it in your own shop, sell what you make from it. There is no licence to buy and no design gated behind a purchase. Shared knowledge is the whole reason this industry has open hardware at all, and we are not going to be the ones who stop passing it on.

This listing is for the finished part: made to order in PETG and shipped from Montreal, Quebec. If you would rather have it in your hands than spend an evening making one, buy it here — that is what pays for the next design in the line. You can also support the open-source work directly through D-Central’s fund page.

Works with

• 8″ Duct Coupler
• 8″ to 6″ Duct Reducer
• 6″ 45° Duct Elbow
• 6″ Window Exhaust Port

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

Frequently asked questions