Avalon A15 Vertical Dual 120 mm to 8-Inch Duct Shroud

Description

Overview

The 8-inch member of the Avalon trio: the same dedicated 122.0 mm stacked-fan capture as the 6-inch version, converging into 8-inch flex duct instead. Larger duct is the usual choice for longer runs or shared plenums, where you would rather the duct not be the tightest point in the system.

Like the rest of the line it is a single-piece PETG part with a flex-over collar: 8-inch duct slips over the collar and a clamp lands on the 201.2 mm sealing land behind the 203.2 mm retention bead.

What it fits

Canaan Avalon A13xx, A14xx and 15XP miners with two vertically stacked 120 mm exhaust fans on a 122.0 mm pitch. One honest note on that number: the 122.0 mm pitch and 105.0 mm screw square come from a single community CAD lineage — the designer’s intent, not a caliper-verified measurement on a production Avalon.

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.

How it is used

Mount the shroud over the two stacked exhaust fans 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 8-inch 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

• Dedicated Avalon geometry: 122.0 mm stacked-fan pitch — 1.0 mm per side away from the Antminer pattern, which mounting-slot slack cannot absorb.
• 8-inch duct for long runs and shared plenums.
• 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 8.6 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

• Avalon A15 dual 120 mm to 6-inch duct shroud
• 8-inch to 6-inch duct reducer
• 8-inch window port

See the full D-Central shroud and ducting system.

Frequently asked questions