Avalon A15 Vertical Dual 120 mm to 6-Inch Duct Shroud

Description

Canaan Avalon A15 shroud: both stacked 120 mm fans into one 6-inch duct

A Canaan Avalon A15 shroud has to solve a problem no Antminer part solves. The Avalon exhausts through two 120 mm fans stacked one above the other, on a 122.0 mm pitch rather than the 120.0 mm pitch every dual-120 Antminer shroud is cut to, and a millimetre per side is more than a mounting slot absorbs. So this shroud is drawn to the A15 exhaust face, 122.0 mm vertical fan pitch and 105.0 mm screw square, and it gathers both fan columns into one 6-inch duct collar.

Six inches is the duct size you can buy in any hardware store on this continent: flexible hose, dryer-vent fittings, inline duct fans, window kits, rigid pipe. That replaceability is worth building a run around. The body is one piece of PETG, which holds its shape in exhaust heat.

What it fits: the Canaan Avalon A15

This is cut for the Canaan Avalon A15 and the archived A15XP CAD-derived interface, and for nothing else in the Avalon range: two vertically stacked 120 mm exhaust fans, 122.0 mm pitch, 116.0 mm bore per fan with a 2.0 mm sealing land around each. The flange mounts on the machine’s own fan screw pattern, and the collar takes 6-inch flex duct.

It is not the part for an Antminer, which sits on a 120.0 mm pitch and wants the Antminer S19 / S21 dual 120 mm to 6-inch duct shroud. On metric ducting, including the 200 mm ducting supplied in the Avalon kit, take the 200 mm Canaan Avalon shroud; for a long or shared run, the 8-inch Canaan Avalon shroud.

How it installs

1. Sit the flange over both stacked exhaust fans and line it up on the fan screw pattern.
2. Drive the screws through the 5.0 mm flange holes (5.424 mm slots), using the Avalon’s own large-head fan screws or a 9 mm or larger flat washer under your own.
3. Slide 6-inch flex duct over the collar, past the 152.4 mm retention bead.
4. Land a worm clamp on the 150.4 mm sealing land behind the bead.
5. Run the duct to a window port, a plenum or the room you want warm.

Why the shape matters

A flat plate with a hole in it is not a shroud. Two fan columns leaving a stacked face are two separate jets, and dropped straight into a round pipe they fight each other in the first 100 mm of duct. This body merges them before the transition begins, then converges what is left into the collar as one stream. The collar is flex-over rather than slip-in, which is the difference between a joint that is clamped and a joint that is taped.

• Captures the Avalon stacked face: 122.0 mm fan pitch, 105.0 mm screw square.
• Merges both fan columns before the transition so they leave as one stream.
• Clamps instead of tapes: 152.4 mm bead, 150.4 mm sealing land, plain worm clamp.
• Keeps at least 8.4 mm of driver clearance around every fan screw head.
• Lands on 6-inch, the most widely stocked duct size in North America.

Specifications

Open source: print it yourself, or buy it finished

D-Central drew this shroud in-house, around the Avalon exhaust face, and gives the design away. It is released under CC BY-SA 4.0 at the 3D models download center, free to download, modify, print and sell. We would rather every Avalon in the world be ducted than own the only file that does it.

D-Central Technologies designed this shroud around the Avalon stacked face and open-sourced it. It is our drawing, made here, not a re-hosted file from somewhere else. The model card is at the A15 6-inch entry and the file is avalon_a15_dual_120_to_6in.zip: the STL, the CC BY-SA 4.0 licence and the installation and safety guide.

This listing is the finished part: made to order in PETG in Montreal, Quebec, in black or orange, and shipped from Canada. The download never costs anything — buying the printed part, or backing the D-Central fund page directly, is what pays for the next design in the line.

Works with

• Canaan Avalon A15 Vertical Dual 120 mm to 8-Inch Duct Shroud
• Canaan Avalon A15 Vertical Dual 120 mm to 200 mm Metric Duct Shroud
• 6″ Duct Coupler
• 6″ 90° Duct Elbow (Compact)
• 6-Inch Flex Duct Window Vent Port

Shroud to window, the whole chain is in the D-Central shroud and ducting system.

Frequently asked questions