The filters used in ChemFAST are manufactured from high grade coconut shell charcoal: all types of activated charcoal used in these filters are of amorphous structure obtained from the heat controlled oxidation of coconut shells. The cellulose structure of the coconuts provides the highest adsorption efficiency through a large surface area of up to 1050 m2/gm. A number of filter efficiency studies have been carried out, and all results using single bed filters show efficiencies very close to 100%.

A wide range of filters is available, from activated charcoal adsorbing filters to chemical adsorbing filters for specific applications such as the use of formalin, glutaraldehyde or radioactive iodine labelled compounds and for others applications:

Prefilters (present as standard): High performance G4 pre-filters are designed to remove particulates from the air stream. The filter material is based on electrets, which are permanently charged di-electrics. They remove particulates from polluted air by strong electrostatic forces generated by the fibers from which they are made.

The combination of strong electric charges and open structure provides a filter with high efficiency, low airflow resistance and high loading capacity. Pre-filter efficiency is equal to 75÷85% dust weight stoppage (ASHRAE).

Main activated charcoal filters (to be chosen and equipped in accordance with the chemical substance to be handled):

• A/C FILTER: it is the most widely used filter in the range, and is used primarily for solvent fume removal. It is manufactured from coconut shell based activated carbon of 4 x 8 USS mesh size and surface area up to 1050 m2/gm. Filtration is achieved by the physical adsorption of molecules in the pores of the activated carbon by Van der Waals forces.

Primary use: organic odors, hydrocarbons, aromatic solvents, animal odors, excrements, urines, acid odors, cadaverine, putrescine.

Secondary use: oxygenated nitrogen compounds.

• ACR FILTER: This filter is impregnated with halide salts and is used for the high efficiency removal of iodine and methyl iodine. It is frequently used for iodination reactions with low-level radioactive iodine and efficiencies in excess of 99,99% have been measured.

Primary use: radioactive iodine.

Secondary use: hydrocarbons.

• FORM FILTER: this filter is impregnate with an oxidizing agent to oxidize formaldehyde to form salts. It is widely used in hospital pathology and cytology laboratories.

Primary use: formaldehyde.

Secondary use: organic emissions, hydrocarbons, aromatic solvents, acid gases.

• SULF FILTER:

Primary use: acid odors, putrescine, cadaverine, acid gases, hydrogen sulphide, methyl mercaptan, sulphur compounds, sulphur dioxide, R.H.>85%.

• UR FILTER:

Primary use: acid odors, putrescine, cadaverine, acid gases, hydrogen sulphide, methyl mercaptan, sulphur compounds, sulphur dioxide, nitrogen oxygenated compounds.

Secondary use: organic emissions, hydrocarbons, aromatic solvents, hydrocyanic acid, R.H. <85%.

• CYAN FILTER:

Primary use: hydrocyanic acid.

Secondary use: organic emissions, hydrocarbons, aromatic solvents.

MER FILTER:

Primary use: mercury vapors.

Secondary use: organic emissions, hydrocarbons.

• AM FILTER:

Primary use: ammonia and its derivatives.

Secondary use: organic emissions, hydrocarbons, aromatic solvents, alkaline odors, excrement, urines, animal odor.

• H14 HEPA/ULPA FILTER

Primary use: powder and particulate.

According to the ChemFAST size model, there are different numbers of charcoal filters to be equipped:

ChemFAST 06 incorporate 1 carbon filter which weighs approximately 13/21,5 Kg

ChemFAST 09 incorporate 2 carbon filters with a total weight of approximately 18/28,8 Kg.

ChemFAST 12 incorporate 2 carbon filters with a total weight of about 26/43 Kg

ChemFAST 15 incorporate 3 carbon filters with a total weight of approximately 32/54 Kg.

ChemFAST 18 incorporate 4 carbon filters with total weight of approximately 32/58 Kg.

*ChemFAST may be optionally fitted with additional charcoal filter whenever the application requires for simultaneous use of different kind of solvents which cannot be retained by standard charcoal filter.