120mm Fan Air Duct Adapter for AV Receiver Cooling

Just mounting a fan isn’t always enough — especially when heat gets trapped in a cabinet or confined space.

That was exactly my situation: I needed to cool down an AV receiver tucked inside a cabinet with barely any vertical clearance.

So I designed this simple but effective air duct adapter to channel the hot air out instead of letting it swirl around doing nothing.

🌀 Fits any standard 120mm PC fan (105mm hole spacing)

📐 Just screw it on top of your fan and aim the airflow where it matters — out of the cabinet, through a grille, away from hot components, etc.

🛠️ Printed in PETG-CF (because I love the look), but it should work just fine with PLA or any other standard filament.

📏 Need it for a different fan size? Let me know — happy to make custom versions.

This adapter helped me reduce temperatures and improve airflow in a tight setup.