Mini 60mm filter 33mm BLDC fan
- ~$10 2 pc 60mm x 85mm Filter
- ~$8 9v battery
- ~$20 speed control brushless fan (adjustable) or $5 alternative brushless fan (noisy)
- ~$3 9v to barrel connector
- ~$3 Barrel to screw terminal
- ~$5 40mm fan guard
- ~$3 2.5mm bungee cord
Optional battery upgrade
Tools needed
- Small screwdriver.
Portable 150mm filter 5v $38
- ~$10 Filter PM501HF, UK , US, Int, About
- $3 mini battery pack
- $12.15 3x 18650 batteries ~3000Mah
- $4.15 120mm 5v fan
- $2.51 Fan Guard
- $1.70 3mm bungee cord to attach fan
- $2.35 speed control screw terminal
- $2.34 right angle USB A cable > Wire
- $3.53 GD90 cap
-
3d print joiner (optional) buy
Will require some crafting
- Small phillips
- Craft knife
- Drill maybe
Instructions
- Place GD90 cap in the bottom of the filter
- Place battery on top & estimate position of USB socket
- In GD90 cap, cut out USB socket, hole for speed control switch & Make cable hole for USB cable
- Cut female end of USB cable and pass through the hole.
- Place speed control circuit board into hole and secure with nut
- Attach power and fan cables to the speed controller
-
Put all the bits together
Wired 150mm filter ~£15 ($20)
- ~$10 120mm USB fan with speed control, UK US
- ~$10 Filter PM501HF, UK , US, Int, About
Affordable filter for a UK/US context
Above image and concept from @thefandilier
Micro 60mm filter
Somewhat documented here https://github.com/samuk/DIY-HEPA/
Notes
Some of the Aliexpress links are affiliate, cos why not. Battery versions currently untested pending parts.
PM501HF/ Pureburg filter dimensions are ID 9cm, OD 15cm, height 10.8cm.
Other alternate filters are documented here by @ridgeocean