8-Inch Flex Duct Window Vent Port

Description

8-inch flex duct window vent port — the outdoor end of a full-size run

An 8-inch flex duct window vent port for the runs that actually move a machine’s whole exhaust: a 248 mm square plate that mounts in a window insert panel, plywood blank or wall penetration, presenting a male collar that 8-inch flex duct slips straight over and clamps behind the retention bead. It is the last part in the chain — shroud, duct, elbow, port, outside.

Eight inches is the size that suits a hard-driven S21, a long duct run with an inline fan pushing it, or two machines merged into one trunk. Getting that volume through a window is a different job from venting a single small miner: the duct is heavier, it pulls harder on whatever it is attached to, and the opening is big enough that how it is mounted starts to matter structurally. This plate is drawn for that: gussets tying the collar into the face, countersunk mounting holes so the sash closes flush, and a gasket groove around the opening. The plate itself is only 39 mm deep, which is how a 248 mm flange still sits tight against the panel instead of standing off it.

Through the bore it runs 196.4 mm — the collar has to be male for flex duct to slip over it, and a male collar is the version a flex core can clamp to. The rigid 8-inch port keeps a larger 204.0 mm socket for runs that end in pipe. Pick by what your last metre is made of, not by the number.

What it fits — 8-inch flex duct and a removable panel

• 8-inch flex duct, slipped over the male collar and clamped on the land below the bead.
• Window insert panels, plywood, rigid insulation board or a wall penetration, through the countersunk mounting holes.
• A gasket or foam strip in the groove, sealing plate to panel.

Running rigid pipe to the window instead? The 8″ Window Exhaust Port takes rigid into a socket and holds the larger 204.0 mm opening. Venting a single smaller machine? The 6-Inch Flex Duct Window Vent Port puts the same features on a 210 mm plate that fits narrower window tracks.

How it installs

1. Cut a panel to your window track. At 248 mm square, the plate needs a genuinely full-height panel — check the sash opening before cutting.
2. Cut the opening, seat a gasket or foam strip in the groove, and screw the plate down flush through the countersunk holes.
3. Press an insect-screen disc, cut to the bore plus about 7 mm, into the rebate behind the retention tabs. Screen material is not supplied.
4. Slide the 8-inch flex duct over the collar, clamp it on the land, and support the duct’s weight on a strap so the port is not carrying the run.

Why the mounting is the engineering, not the hole

Anyone can cut a 200 mm circle. What breaks a window vent is everything around that circle: the flex duct hanging off one side of it, the sash pressing on the other, and a hot airstream running through a plate that is trying to seal against a rough-cut panel edge. The gussets carry the duct’s pull into the plate face instead of the collar root. The gasket groove holds a seal in place permanently rather than relying on tape to stay stuck to a warm surface. The countersunk holes let the screw heads sit below flush so the sash closes onto a flat face and the window still locks.

The opening itself is clear — a single-piece port, no flap, no hinge, nothing to chatter at three in the morning while the machine runs. That is the right choice for continuous operation. If you shut down for the summer or the window faces the wind, put an inline backdraft damper in the run or blank the run off at the shroud end.

• Terminate a full-size 8-inch flex run at the wall in one part.
• Take the pull of a heavy insulated duct on gussets tied into the plate.
• Seal to the panel with a gasket in a dedicated groove, not tape on a cut edge.
• Sit flush under a closing sash thanks to countersunk mounting holes.
• Keep insects out through a built-in screen rebate with retention tabs.
• Leave nothing behind when you take it out — the panel and the port both lift away.

Specifications

Open source — the design is published, the part is made here

The plate, the gussets, the gasket groove and the screen rebate are D-Central Technologies’ own drawing — ours from the first line, not a remix — and they are released under CC BY-SA 4.0 at the 3D models download center, free to download, modify, remix, print and sell. The model card is the 8-inch flex window port. Anyone with the build volume for a 248 mm plate can make one, and we would rather they did than that a miner ran unvented.

Everything is in window_port_8in_flex.zip — the STL, the CC BY-SA 4.0 licence, and the installation and safety guide. This listing is the finished port, made to order in PETG and shipped from Montreal, Quebec; black and orange are both stocked. The download stays free forever; buying the port, or giving at D-Central’s fund page, is what funds the next design in the line.

Works with

• 8″ Window Exhaust Port
• 8-Inch Flex Duct Adapter — Rigid Socket to Flex Collar
• Antminer S19 / S21 Dual 120 mm to 8″ Duct Shroud
• 8-Inch Long-Radius 90° Airflow Duct Elbow
• 8″ to Dual 6″ Y-Splitter

Lay the whole run out with the D-Central shroud and ducting system.

Frequently asked questions