Internal active air filter

My goal was to create an effective filter based on currently available and cheap cartridges.
I chose the following parts:

A quiet and effective fan
- first choice was Noctua NF-P12 redux-1700 PWM.


Activated carbon filters - there are so many on the market, but I found ones that fit the design and most importantly, will last a long time with minimal loss after trimming (because they are made to measure).
Activated carbon filters



HEPA filters - You have a lot of choices here. Maybe you will find cheaper ones in your store because homemade robots are becoming very popular and that's a good direction for us.
They must be standard iRobot Roomba 800.



Installation begins with mounting brass threaded inserts M3x5x5 or M3x5x6 to the blower holes.
This is the critical point in the assembly of the whole. The entire housing rests on these inserts on both sides. Follow the order in the photos.

When it comes to printing, there are no special requirements. Do it accord