Home Assistant Compatible Solder Fan (120mm)

Parts

• ESP32
• 120mm PC Fan (high static pressure)
• 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".
• 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 the minimal loss after trimming (because they are made to measure).
• DC Boost/Step up converter
• Micro USB breakout board
• m3x20mm screws
• m3x5 heat set inserts

Assembly

• Mount M3x5x5 or M3x5x6 heat set inserts to the back holes on the fan
• Cut out the activated carbon filter to fit in layer 4 (carbon filter frame) and fit it into the layer.
• Put 4 and 5 (HEPA Frame) together, run the M3 screws through and thread them into the heat set inserts in the fan
• Add the HEPA filters into layer 5, and then add layer 6 (end frame) over the top of the HEPA frame. Screw in the end frame to the HEPA frame and its complete.

Notes

• You'll want to find the right screws to keep good tension between the fan and exterior frame, else you'll need some tape to help it hold its position.