140mm Fan to 100mm Duct Adapter

140mm Fan to 100mm Duct Adapter

A simple, no-supports adapter that connects a standard 140mm fan to 100mm (4") ducting. Great for fume extraction, workshop ventilation, and general airflow projects.

🔧 What it's for

- Soldering / 3D printing fume extraction

- Workshop and garage ventilation

- Connecting a 140mm fan to flexible aluminium or PVC duct

- General airflow and cooling setups

📐 Specifications

- Fan side: 140 × 140 mm flange with standard mounting holes

- Duct side: 100 mm outlet

- Height: ~49 mm

- Smooth internal transition for minimal airflow loss

🖨 Recommended print settings

- Material: PLA or PETG (PETG if exposed to heat or sunlight)

- Layer height: 0.2 mm

- Walls: 3 perimeters

- Infill: 15–20%

- Supports: None — prints flat on the flange

- Orientation: 140mm flange flat on the build plate

🔩 Assembly

Mount the fan to the 140mm flange with standard fan screws, then slide your 100mm duct over the outlet and secure with a hose clamp or tape.

💬 Notes

Need a different fan or duct size? Drop a comment — happy to remix. If this was useful, a like or boost is hugely appreciated and helps me keep designing! 🙌