The fan I used was an unused fan from a BitFenix Shinobi XL Tower computer case:-

BitFenix Spectre™ fans. 230mm diameter

The Boost convert:-

Boost Buck Voltage Module Step Up/Down Converter Regulator 3-35V or 2.2-30V eBay Seller Seller :accecity-ca

The carbon filters Carbon Fibre Oven hood filters, these come in a sheet that may be cut to size, with care you will most likely get two. ( I use a bigger and a smaller filter as a double filter), lots of filters to use:-

Carbon Universal Cooker Hood Filter 47cm x 57cm eBay Seller reliant-cleaning-services

Cardboard Box to fit it all in

Rocker Switch, before the Boost Converter so when turned off no power is used by the Boost Converter

http://www.icstation.com/advanced_search_result.php?keywords=switch+rocker&search_in_description=1

USB Cable and other cables, etc..

Hot Glue

Solder and soldering iron

Heat shrink tube where required