Catalyst cracking is an important conversion process used in the refining of petroleum products. It is especially useful in converting heavy fractions of crude oil – those with a high boiling point and low volatility - into more useful highly volatile products like gasoline. The actual is a powder or sand like material which is heated and combined with high temperature boiling hydrocarbon feed stock at the bottom of a pressurized distillation column. The catalyst cracks the heavy fractions (long chain molecules) into lighter fractions (short chain molecules) which immediately volatilize into gasses which fluidity the particles of catalyst which aids the process.The products (gasoline etc. ) are recovered in a distillation column. Any catalyst fines carried over into the flue gasses are recovered from the gas stream usually by two stage cyclones. After heat recovery and combustion of Carbon Monoxide (to raise steam needed at the front end of the process) the final flue gasses are cleaned usually with an electrostatic precipitate although a high temperature bag filter can also be used. The whole process ingests significant quantities of air which must be pre-filtered. The collection of recovered catalyst and handling of new catalyst will require particulate filtration. AAF can offer several filter types to match the different applications present.