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Filters

Replacement Filters

We offer a wide range of activated cabon (AC) replacement filters, that are fully optimised for the adsorption of hazardous materials. We supply a wide range of filters for popular ductless fume cupboards including custom ductless filters not offered by the OEM. Each supplier can predict the chemical volume in grams or mililitres that can be retained by the filter in each unit prior to desortion taking place.

If you have concerns over which filters to choose for specific chemicals, as there are hundreds of different types of activated carbon and each is made for different specific applications, ask for a copy of our Chemical Reference List.

Filter Options / Filter Types

PRE-Filters - Filtrete high performance electrostatic materia designed to remove particulates from the air stream, including aerosols and mists. 99% efficient for particle size 0.5 micron. Required on all Ductless models.

HEPA Filters - A High-Efficiency Particulate Air (HEPA) filter removes powders and particulates.

GP Plus Filter - The most widely used filter in our range, primarily for solvent, organic and alcohol fume removal. It is manufactured from coconut shell based activated carbon of 5-10mesh.

ACI Plus Filter - This alkali impregnated filter will neutralise volatile inorganic acid vapours, such as hydrochloric and hydrofluoric acids and acid gasses such as Sulphur and Nitrogen Dioxides.

ACR Filters - This filter is impregnated with halide salts and is used for the high efficiency removal of iodine and methyl iodide.It is frequently used for iodination reactions with low radioactive iodine. Efficiencies in excess of 99.99% have been measured.

ACM Filters - This filter is impregnated with iodine compounds for removal of mercury vapour. The filter has been demonstrated to remove mercury from a saturated air stream at ambient temperature tobelow 5 ppb in the exhaust air stream.

AMM Filter - This filter is impregnated with copper compounds to efficiently remove vapour from dilute ammonia solutions, and to remove low molecular weight amines.

SUL Filter - This is a potassium iodide impregnated filter designed to remove hudrogen sulphide and low molecular weight mercaptans.

CYN Filter - This is a multi impregnated filter to a military specification, for removal of hydrogen cyanide gas. Many cyanide compounds will evolve HCN ga if acidified, so this filter is normally specified if working with any cyanide compounds.

FOR Filter - This filter is impregnated with an oxidising agent to oxidise formaldehyde and glutaraldehyde fumes. It is widely used in hospital pathology laboratories and endoscopy units.

ETH Filter - Diethyl ether is absorbed on activated carbon but because of its low boiling point, the local heat absorption can reduce the capacity of the filter. Special impregnation allows a chemical reaction which increases the filter capacity.

EDU Filter - This multi-layered filter is designed to handle chemical normally used in a university level chemical curriculum.

MIL Filter - This multi-layered filter is designed to handle chemicals normally found in military applications. 

Carbon Filter Introduction

Fume cupboard (hoods and cabinets) provide protection from fumes and vapours that are created by processes in the biotechnology, forensic, life science and pharmaceutical industry. Fume cupboards can be ducted into an existing HVAC system of can be ductless.

Ductless filtration systems provide highly efficient, sustainable protection in portable, standalone equipment that can fit in nearly any laboratory. In addition to energy efficiency, capital inverstment savings and customisable filtration, ductless cupboards can be designed to equivalent or safer performance than ducted units.

There are, however, limitations to ductless technology and possible safety consequences from the misuse of ductless fume cupboards. It is important therefore to know recommended guidelines for ductless fume cupboards and appropriate carbon filtration.

Factors That Affect Adsorption Efficiency

The ability of a filter to function efficiently is dependent on a number of factors including temperature, humidity, residence time, age of filter, evaporation rate and concentration.

Temperature - The temperature of the gas is very important. The higher the temperature, the lower the adsorption capacity, especially for a gas with a low boiling point. As a general rule temperature must be kept below 40°C (104°F).

Humidity - Relative humidity is also an important factor that can affect the efficiency of the filter. The molecules of gases with low boiling points will be less readily adsorbed, because the molecules of the water vapour will be adsorbed in their place, leaving less free surface in the pores for the gas molecules to impact the carbon. As a general rule, the relative humidity must always be kept below 60%.

Residence Time - Residence time is the time needed by the air to cross the filter, during which it stays in contact with the carbon itself. This is the time during which the molecules of gas can be adsorbed by the pores of the carbon and should be as long as possible. To maximise residence time, the thickness of the filter must be sufficient and the air speed crossing it must be kept to a minimum. This minimum is influenced by the fact that the air speed across the front opening of the fume cupboard (face velocity) must be kept at a rate sufficient to insure containment of the fumes within the enclosure.

Filter Age, Evaporation Rate, and Concentration - Carbon filters, if not properly stored before use, become less efficient with time.
Additionally, the rate at which the chemical is being evaporated and the concentration of chemical vapours within the enclosure will likewise impact efficiency with the higher evaporation and concentration having a negative impact on efficiency.

Filter Maintenance is Essential

Each ductless equipment manufacturer specifies replacement intervals for filters used in its products. Proper filter maintenance is essential for such equipment since all carbon filters have a capacity limit for the hazardous vapors that they remove from equipment exhaust. Without proper maintenance and periodic service, personnel may be exposed to those vapors with adverse health effects.

Even an ordinary, everyday chemical may be hazardous when exposure exceeds a threshold limit value (TLV), the concentration level at which it becomes harmful to health.

Advantages of Filtco Products

  • More than 14 formulations
  • Savings over 50% on some filters
  • A Filtco chemical guide with each filter
  • In-service date sticker for each filter
  • Thermally formed polypropylene filter case eliminates metal that can react with chemicals
  • Computer tracking of customer usage
  • Pressure packed carbon, heat sealed to prevent channeling or movement; carbon is not sprayed or bonded
  • Certificate of compliance for each filter
  • Extended warranty with each filter purchased

Note: To the extent that FILTCO uses trademarks, service marks, trade names, part numbers, or other identifying information of other companies, FILTCO is making use of those Trademarks and part numbers for identification and cross references only. All trademarks are owned by their own respective companies.

Filtco Filter Specifications

Manufacturers’ Statement

Filtco has designed our carbon media and filter manufacturing processes over several years. Filter assembly is carried out under strictly controlled conditions. We maximize the efficiency of each carbon filter by assuring the quality of carbon media, the cartridge casing and the manufacturing method used.

Filtration Efficiency

Filtco filters deliver an efficiency of 99.9% during their service life (to the point of saturation), for all chemically active molecules/chemical materials, including any most chemicals with a molecular weight above 30 and a boiling point above 60°C. Certain other chemicals also are well adsorbed because of their molecular size and structure. To request the Chemical Adsorbancy Listings for Filtco carbon filters click here.

Carbon Media

Filtco carefully sources our carbon feedstock which as required includes the addition of thoroughly researched additives (see vapor handling). Each activated carbon media batch is tested to verify its optimized retention capacity and to assure superior performance of the finished filters.

Filtco filter casings are manufactured from reinforced thermoplastic to produce a lightweight yet sturdy assembly for ease of handling and installation. The casing provides very high impact strength, excellent dimensional stability and chemical resistance. Casing geometry is configured with numerous individual cells for carbon media to help prevent settling or shifting.

Filter Assembly

Each casing is filled with activated carbon media, tightly packed to avoid settling during shipment, then weighed to verify proper amount of media to achieve target vapor retention capacity.

Some Filtco models include pre-filters (particle or HEPA filters). See Manufacturers Filter Types for more details. For such models, the pre-filter is attached.

The assembled filter, with its pre-filter (if applicable) then are packed into a heat sealed plastic bag and robust box for shipping.

Testing

Filtco carbon filters comply with the requirements of British Standard BS7989:2001 and European Standard AFNOR NF X 15-211

Filter Casings

Filtco filter casings are manufactured from reinforced thermoplastic to produce a lightweight yet sturdy assembly for ease of handling and installation. The casing provides very high impact strength, excellent dimensional stability and chemical resistance. Casing geometry is configured with numerous individual cells for carbon media to help prevent settling or shifting.

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Contact us for further information on 0113 245 4111 or click to fill in our Contact Form.

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