6″ 90° Duct Elbow (Compact)

Description

6 inch 90 degree duct elbow, compact envelope

A 6 inch 90 degree duct elbow in compact form is the fitting for the space you actually have. The machine is 15 cm off the wall. The rack has a solid back. There is a shelf directly above the shroud outlet. In those installs the elegant answer, two 45s with a straight between them, simply does not exist — and the run still has to turn.

This part turns it inside 203.8 × 203.8 × 159.6 mm, which is about as tight as a right angle can be drawn in 6-inch duct while keeping the bore open the whole way through. Standard 6-inch collars on both ends, so it drops into the same run as everything else in the line.

What it fits, and where to use it instead of the alternatives

Standard 6-inch duct on both ends, rigid or flexible, and every 6-inch fitting, shroud and silencer in the line. This is the elbow for rack backs, wall drops, joist bays, cabinet interiors and any run that turns immediately behind the machine.

It is not the elbow for a long, bend-heavy run with room to spare — that is what pairs of 45° elbows are for. If the run is 8-inch rather than 6-inch, the equivalent part is the 8″ 90° Duct Elbow (Compact).

How it installs behind a machine

1. Fit the elbow to the shroud or duct outlet first and clock it to the direction the run has to leave in.
2. Clamp that side while you still have access to it.
3. Bring the outgoing duct onto the second collar and clamp.
4. Support the outgoing duct within a short distance so the elbow is sealing, not carrying.

Clamping the machine-side joint before the run is attached is the difference between a five-minute job and a knuckle-bruising one, because the space behind a mounted miner disappears the moment the duct is in it.

Why a compact 90 is the right call in a tight bay

A right angle that fits is worth more than a gentler turn that does not. Forcing a long-radius elbow into a bay it does not suit means kinking the flex duct on either side of it, and a kinked flex duct is a far worse restriction than any fitting. The compact 90 keeps the bore fully open through the turn and takes the whole direction change inside a known envelope, so the ducting either side of it stays straight and round.

• Turns a full right angle inside 203.8 × 203.8 × 159.6 mm
• Keeps the 6-inch bore open through the bend instead of flattening it
• Lets the flex duct either side stay straight and unkinked
• Clocks to any orientation before the clamps are tightened
• Swaps out for a pair of 45s and a short straight if you later gain the clearance

Specifications

Open source — free drawings, finished parts

The compact 90 is D-Central Technologies’ own geometry: we designed the part, drew the envelope, and open-sourced the result under CC BY-SA 4.0 at the 3D models download center, along with the rest of the ducting family. Its card is the compact 6″ 90° elbow model. Free to download, modify, remix, print and sell — if your bay is an odd shape, take the file and change the envelope to suit it. That is what an open file is for.

Download it as elbow_90_6.zip, which carries the STL, the CC BY-SA 4.0 licence, and the installation and safety guide. This listing is the finished elbow, made to order in PETG and shipped from Montreal, Quebec; black and orange are both stocked colours. The file stays free permanently; buying the printed part, or giving through D-Central’s fund page, is what draws the next fitting in the line.

Works with

• 6″ 45° Duct Elbow
• 6″ Duct Coupler
• Antminer S19 / S21 Offset Shroud — Dual 120 mm to 6″
• 6″ Window Exhaust Port

Fittings that mate on the first try because they came from the same drawing set: see the D-Central shroud and ducting system.

Frequently asked questions