Radiator fan / Radiator booster (Type 33)

Increase heating performance and save energy! This modular radiator booster for radiator type 33 solves the problem of heat accumulation – especially behind radiator covers or under windowsills. Active air circulation heats the room faster and the heating works more efficiently (perfect for heat pumps or low flow temperatures)

Highlights:

• Modular: Print as many elements as your radiator is wide.
• Quiet: Optimized for Arctic P12 Silent (120mm) fans.
• Low Vibration: Designed for use with rubber fan mounts.
• Flexible: Magnets allow the fan to be mounted and removed anywhere.

The mount is designed so that any magnets up to 20mm in diameter can be installed. The recess is designed for 2mm magnets, and the protruding lips on the side allow the mount to be easily pushed under the heater without getting caught on the magnets

For my setup, I used 6 pieces of 15mm x 2mm magnets for each mount. As a power supply, I recommend an adjustable 3–12 V model to conveniently adjust the fan speed (and thus the volume) via the voltage. The fans can be directly connected to the power supply via Wago terminals and extended. The pinout of the fan connector can be viewed on the manufacturer's website

Note: Make sure the fans are not PWM fans, but rather have their power fixed at 12V. The correct fans are linked below

Control is smart via a Shelly Plug in conjunction with Home Assistant

Model Variants

Radiators are not standardized. The internal dimensions and the thickness of the fins vary depending on the manufacturer

To determine the correct model, the internal dimension between the two outer fins (A) and the internal dimension between the central webs of the two outer fins (B) should be measured

Model A

e.g. Kermi

Model B

e.g. Buderus

Is your model not listed? No problem! If you send me the relevant data via private message, I can gladly make an adjustment. The specifications for (A) and (B) are important.

Installation

1. Place the fan into the booster. Depending on the model, you may need to insert the fan at an angle.
2. Insert the fan mounts from below and let them snap into place. Attention: There is a snap point for the fan and one for the booster!

When using the fan mounts, make sure they are long enough! Mounts with the correct length are linked below

Material

PETG, ABS or ASA. Please DO NOT use PLA! Radiators get warm, PLA becomes soft and deforms. I chose Bambulab ASA

Material List & Sources

• ARCTIC P12 (5 pieces) 120 mm case fan, 12V
  https://amzn.to/4pExD9m
   
• WAGO connection terminals (consider how the connections will be built beforehand. Wago terminals are available in different sizes)
  https://amzn.to/4jRImvV
   
• 20 pieces rubber fan mounts (sufficient for 5 fans)
  https://amzn.to/45VvCOZ
   
• Neodymium Magnets 15mm x 2mm
  https://amzn.to/49CyLo9
   
• Power Supply 12V, 3-12 Volt adjustable
  https://amzn.to/4sQKIzh
   
• Shelly Plug for smart control
  https://amzn.to/3YGfY6o
   
• Superglue for attaching the magnets
  https://amzn.to/4qJd50J

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