"THE_BOOSTBOX" Modular 120mm 140mm PC Fan Duct Booster Airflow Booster Boostbox

Boostbox – Modular Fan Booster for The Ring Connector V1.3

The Boostbox is a modular fan booster module for my The  Connector V1.3 system.

It is designed to support airflow in hose, duct and filter setups by using standard PC axial fans. The Boostbox can be used as a simple fan module or as part of a larger modular airflow system.

It is not intended to fully replace a high-pressure inline fan, but it can be useful for lightweight ventilation, extraction, filtering and airflow experiments.


Changelog:

25.07.2026 - added 100/125/150mm versions for 120x38mm fans such as ebmpapst 4656 N

Printing Notes

- Insert magnets while printing !
- Print it with connector on printbed

Recommended settings:

• Material: PLA, PETG, ASA

• Nozzle size: 0.4 mm

• Layer height: 0.25 mm

• Perimeters: 2

• Infill: 15–25 %

• Supports: not required

Compatibility

The Boostbox is compatible with the The Connector V1.3 geometry.

Please note that it is designed for the updated V1.3 connector system and not for the old V1.0 connector geometry.

Currently Available Sizes

The currently available versions allow the following combinations of hose diameter and PC fan size:

• 100 mm hose / 120x25 mm PC fan

• 110 mm hose / 120x25 mm PC fan

• 125 mm hose / 120x25 mm PC fan

• 125 mm hose / 140x25 mm PC fan

• 150 mm hose / 140x25 mm PC fan
  ------------------------------------------

• 100 mm hose / 120x38 mm PC fan

• 125 mm hose / 120x38 mm PC fan

• 150 mm hose / 120x38 mm PC fan

Please check the file names before printing to choose the correct version for your setup.

Required Hardware

For assembling the Boostbox, you need:

• 16× M3 x 16 mm screws

• 16× M3 self-locking nuts
  - melt-inserts for fan mounting

The bayonet connector uses M4 screws and magnets, just like the regular Connector.
The required number of M4 screws and magnets depends on the size of the Boostbox connector.

Special Sizes on Request

The Boostbox is based on a parametric model. This means that other size combinations are already possible in the design.

If needed, I can provide special versions on request, for example for non-standard PC fans or industrial fans. This may be useful if you want to use a 220 V fan with a different frame size or a larger fan depth, such as 38 mm.

Please note that I will only provide these special sizes on request.

Plenum and Airflow Straightener

The plenum is an empty chamber that gives the air more space before it reaches the next section. This helps calm and distribute the airflow more evenly.

The airflow straightener uses a honeycomb structure to guide the air into a cleaner, more directed path and reduce turbulence.

This combination of plenum and airflow straightener is especially useful when using two PC fans in series. Multiple axial fans in series can improve airflow performance, but the effect is normally limited by turbulence and disturbed airflow between the fans.

The plenum and airflow straightener help reduce this effect and can improve the usable performance output of a dual-fan setup.

Please note: the honeycomb is not a filter. It is an airflow guide and will also create some airflow resistance.

Planned Extensions

The Boostbox is intended to become part of a larger modular airflow system.

Planned future extensions include:

• an activated carbon filter module that can be mounted directly to the Boostbox

• additional adapter combinations

• a revised seal that allows the Boostbox to be mounted in different positions

This means that the Boostbox itself should not need to be reprinted for this later mounting option. Only the seals would need to be replaced.

The goal is to expand the system step by step while keeping it compatible with The Ring Connector V1.3 geometry.

Possible Use Cases

• airflow support for hose systems

• light extraction setups

• modular ventilation experiments

• filter or pre-filter setups

• testing different PC fan combinations

• use together with The Ring Connector V1.3 system

Important Notes

The Boostbox is a DIY airflow module and should be seen as an experimental maker project.

Please keep in mind:

• PC fans usually have limited static pressure compared to real inline or radial fans

• filters, long hoses and tight adapters can strongly reduce airflow

• multiple fans in series can improve airflow performance, especially when combined with the plenum and airflow straightener setup

• for demanding ventilation systems, a proper inline fan may still be the better choice

• fan mounting points may need small adjustments depending on the exact fan model