This is a homemade ventilation system for home use. It's made from an Target clear plastic box.
Goal is to use easy to get parts to make a portable air purifier or fume extractor for work and Hobbyist activities.
Step 1: Parts/Tools You Might Need:
1 x Clear plastic box - Sterilite® 6 Qt Clear Storage - $0.97
1 x HEPA air purifier - Holmes AER1 HEPA Type Total Air Filter - $ 13.99
2 x 120mm high cfm Fan (work with 5V and 12 V) - Protechnic Fan 12V, 120 x 120 x 25mm - $7.5 x 2
1 x 120mm finger guard and mounting - 120mm Fan Grill Finger Guard & round rubber feet - $ 7.99
1 x 5V to 12V DC/DC converter - USB DC 5V TO 12V Step-up - Optional - $ 5.63 (From China)
1 x 2.1mm x 5.5mm female power jack adapter - 2.1mm x 5.5mm Female CCTV Power Jack Adapter
1 x Power bank
2 ~ 4 zip tie to hold the air filter.
Tools you might need:
Ruler x 1
Step 2: Making the Box - Air Filter
Use the exacto knife and metal to cut the rectangle shape for the HEPA air filter.
Use zip tie to secure the air filter.
Step 3: Making the Box - Fans and Mounting
Use the 120mm finger guard as a guide and cut it with exacto knife.
Make 4 holes for the mounting.
Put the rubber into the top cover mounting holes first will be easier for next step.
Pull the rubber all the way to make sure it's tight and secure.
Step 4: Powering Up the Air Purifier
Connect the fan wire to the 2.1mm x 5.5mm female power jack adapter. Red to +(plus) and Black to - (minus)
Connect USB power cable to 2.1mm female power jack adapter and plug in the usb port to the power bank.
At this point you should be able to see the fan running.
To get a high speed, insert the 5V to 12V Converter in between and the fan will run at full speed.
Step 5: Conclusion
I use low speed while I was in the office and I put it in high speed when I was in the garage working on Arduino project. So far this thing works great. Some decoration might make it looks better.