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

Description

Canaan Avalon A15 shroud, dual 120 mm to 8-inch duct, for long runs

Choose a Canaan Avalon A15 shroud by the duct you are going to run, not by the machine. Duct costs you pressure by the metre, and it costs you more at every bend; a run that crosses a basement, climbs to a soffit, or feeds an inline fan two rooms away is a different job from a metre of hose out a window. This is the 8-inch member of the Avalon family, for exactly that job: same dedicated stacked twin-120 capture, a much larger pipe to breathe through.

The fan side is drawn to the Avalon exhaust face: two 120 mm fans stacked vertically on a 122.0 mm pitch with a 105.0 mm screw square, a millimetre a side away from the 120.0 mm Antminer pattern. Both columns merge inside the body and leave through one 8-inch collar.

Eight inches is also the size the popular inline duct fans and filter kits are built in, so this collar drops the Avalon into that ecosystem with no step-up fitting in the way.

What it fits: the Canaan Avalon A15 on 8-inch duct

The Canaan Avalon A15, and the archived A15XP CAD-derived interface it was drawn against, with two vertically stacked 120 mm exhaust fans: 122.0 mm pitch, 116.0 mm bore per fan, 2.0 mm sealing land per side. Other Avalon families use a different exhaust face and are not covered. The outlet takes 8-inch flex duct over a flex-over collar with a 203.2 mm retention bead and a 201.2 mm sealing land.

Running something else? Dual-120 Antminers use the 120.0 mm pitch and want the Antminer S19 / S21 dual 120 mm to 8-inch duct shroud. On a short run, or where 6-inch fittings are what you already own, the 6-inch Avalon version is the cheaper build. On metric ducting, including the ducting supplied in the Avalon kit, use the 200 mm metric version.

How it installs

1. Line the flange up on the fan screw pattern over both stacked exhaust fans.
2. Screw it down through the 5.0 mm holes (5.424 mm slots), using the Avalon’s own large-head fan screws or your own hardware with a 9 mm or larger flat washer under each head.
3. Push 8-inch flex duct over the collar and past the 203.2 mm retention bead.
4. Tighten a worm clamp onto the 201.2 mm sealing land behind the bead.
5. Run the duct to its inline fan, plenum or window port, necking down downstream with an 8-inch to 6-inch duct reducer if you must.

Why a bigger collar earns its place

Air in a duct loses pressure to friction against the wall, and the smaller the pipe, the more wall there is per unit of air moving past it. That is why duct diameter matters more the longer the run gets: on a metre of hose the pipe barely registers, and on fifteen metres with three bends it is the dominant term. Sizing the collar up at the machine means you never have a step-up fitting sitting in the flow doing nothing but shedding pressure.

• Opens the exhaust to 8-inch so the duct, not the shroud, sets the ceiling on a long run.
• Drops straight onto 8-inch inline fans and filter kits with no step-up fitting.
• Holds the Avalon-specific stacked geometry: 122.0 mm fan pitch, 105.0 mm screw square.
• Seals with a clamp, not tape: 203.2 mm retention bead, 201.2 mm sealing land.
• Leaves at least 8.6 mm of driver clearance around every fan screw head.
• Comes out as one piece of PETG, which shrugs off exhaust heat.

Specifications

Open source: the design is free, the part is made for you

Every shroud in this line is D-Central’s own drawing, and every one of them is given away. The files live at the 3D models download center under CC BY-SA 4.0: download them, change them, print them, sell them. Ducting an ASIC properly should not depend on who owns a CAD file. This one has its own card at the A15 8-inch entry, and the file is avalon_a15_dual_120_to_8in.zip — the STL, the CC BY-SA 4.0 licence and the installation and safety guide in one download. What this listing sells is the finished 8-inch Avalon shroud, printed to order in PETG in Montreal, Quebec and shipped from Canada, in black or in orange. Nothing about the file changes when you buy one; what buying it, or backing the D-Central fund page, does is pay for the next collar in the range.

Works with

• Canaan Avalon A15 Vertical Dual 120 mm to 6-Inch Duct Shroud
• Canaan Avalon A15 Vertical Dual 120 mm to 200 mm Metric Duct Shroud
• 8″ to 6″ Duct Reducer
• 8″ Duct Coupler
• 8″ Window Exhaust Port

See how the pieces chain together in the D-Central shroud and ducting system.

Frequently asked questions