This is a compact, modular desktop air purifier designed especially for personal spaces such as desks, bedside tables, or workbenches.

Key Features:

• Stackable modular design — combine different functions as needed
• Each stack is 3 cm tall, keeping the overall size compact
• Uses a 120 mm (12 cm) USB fan
• Rotatable air outlet with adjustable up/down and left/right airflow
• Simple, easy-to-print structure

Filter System:

• HEPA filters for pollen and dust
• Activated carbon module with a dedicated box for loose carbon
  • Effective for TVOCs and odors
• Filters can be mixed and stacked to create a personalized setup

Airflow Notice:

• Airflow depends on the number of stacked modules and the resistance of the filters used
• A high-RPM or speed-adjustable USB fan is recommended for best performance
• You may stack multiple fan stacks if you need more air. 

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A solution for hay fever sufferers who want clean air exactly where it matters most.

Installation Guide

Simply stack them together.

A normal sequence,  from bottom to top, is Active carbon → HEPA → Fan

For fan stack, you will need to cut the hole for wires.

Active carbon filter:

HEPA filter

if you can, buy 12x12 modular HEPA filter. If you cant find them, just buy a larger one and cut them into 12x12cm, make sure they are less then 3cm tall. 

BOM

• 12 x 12 x 2.5cm USB Fan 2000rpm

• HEPA filter : you need to customized 12 x 12 x 2.5 filter. You may buy larger one then cut them into the size. 
• Active carbon: 
  • you may buy Coconut Shell Granular Activated Carbon and use the printed carbon box. 
  • or use sheet carbon filter and cut them into size.