This is a complete modular exhaust ventilation system designed for 3D printer enclosures.
The main ducts are based on 54×110 mm flat ducting and can be combined with multiple adapters.
The 100 mm outlets are compatible with flexible ducting (Ø100 mm).

I used a 100 mm grow box fan I already had on hand (shown in the photos), but any strong 100 mm inline fan will work.
My fan was modified with a 1-0-2 rocker switch to allow two speed levels.

Ducts and sealing:
The ducts are standard 54×110 mm flat ducts from Marley (DIY store).
They fit into the adapters with minimal play. I fixed them in place with double-sided tape, which is enough to seal the system properly under negative pressure.

Required hardware (not included):

• 100 mm flexible ducting (e.g. standard aluminum flex hose)
• 100 mm hose clamps
• Wall plugs (Ø6 mm) and screws (3.5 × 35 mm) for wall mounting
• 6×2 mm magnets (used in the printer flange for quick attachment)

Modules included in this set:

• T-Pipe Connector
• 90° Pipe Connector
• Straight Connector
• End Cap
• 100 mm Hose Adapter
• 100 mm Window Outlet – can be placed in a tilted window or, as shown in my setup, in a roof window. It is intentionally thicker and reinforced with a center brace, so if wind or accidental closing occurs, the outlet does not get damaged. The outlet is printed in two parts to avoid unnecessary supports, and the two halves must be glued together after printing.
• 100 mm Flange (with magnet slots for 6×2 mm magnets, mounts directly to the printer enclosure)
• Wall Mount Bracket 1 – used together with the 100 mm hose adapters to keep proper clearance between the adapter and the wall.
• Wall Mount Bracket 2 – used with the End Cap, Straight Connector and 90° Connector for stable wall mounting.

Recommended print materials: PETG or ASA for temperature resistance and long-term durability.