DIY Under-Door Fan Duct

This repo holds the CadQuery code for the fan duct I designed to stop waking up groggy. It attaches to a standard 120mm PC fan, sits on the floor, and pushes air out under the door.

The Backstory

The project started when I found out my sealed bedroom's CO₂ levels were hitting 1,700 ppm overnight. After a few experiments with pizza boxes and over-engineered prototypes, I landed on this simple, effective design.

I wrote the full story here: DIY Door Fan to Fix My Groggy Mornings.

Neat Stuff

• Fully parametric. Tweak all the numbers in constants.py to fit your door and fan.

• Quiet & efficient. The smooth lofted transition minimizes air noise and friction.

• Simple print, no supports needed.

Make Your Own

You'll need:

• Python 3.11+
• uv, or any tool that can install dependencies from a pyproject.toml file.

Steps:

1. Clone the repo:

   git clone https://github.com/andrey-lepekhin/diy-door-fan.git
   cd diy-door-fan

2. Install the dependencies: This sets up a virtual environment and grabs everything you need.

   uv sync

3. Tweak the model (optional): Open constants.py and change the numbers to fit your setup.

4. Generate the STL:

   uv run main.py

   You'll find your file ready to slice in the stl/ directory.

5. See a live 3D preview (optional):

   uv run CQ-editor

   Then, open main.py from inside the editor.

License

This project is licensed under the Apache License 2.0. See the LICENSE file for details.