TOPIC: Air Circulation
The natural convection that occur when hot air rises was used by the Ancient Romans to air condition their homes. Hot Air can drive a fan. Activated Carbon air filters made from Carbon Fiber can be made at home inexpensively from a Parts List, Using a Fan and a Bucket, making a Filter Bed for the Filter Layers of Charcoal, adding a Vent Tube and Cord, and activating the charcoal with a Charger that emits an Ion Spray. A more expensive alternative is a Solid State device. An Ozone producing device can be constructed to purify air.