NOTICE

Hurricane Irma Update

The Air Science office is currently closed.
As Hurricane Irma passed through Fort Myers this weekend, the Air Science facility sustained minor damage to two of our buildings. We expect to be back in operation as soon as it is safe for our employees to secure their own homes and return to work.
Please contact us at info@airscience.com as usual; this address will be monitored continuously.
We thank you for your understanding.
La oficina de Air Science está actualmente cerrada.
Cuando el huracán Irma pasó por Fort Myers este fin de semana, la instalación de Air Science sufrió daños menores en dos de nuestros edificios. Esperamos volver a trabajar tan pronto como sea seguro para nuestros empleados asegurar sus propios hogares y volver al trabajo.
Comuníquese con nosotros en info@airscience.com como de costumbre; esta dirección será monitoreada continuamente.
Gracias por su comprensión
With power restored, we are pleased to announce that the Air Science factory and offices will re-open on Wednesday, September 13, 2017.
Due to Hurricane Irma, we may see some delay in processing quotation requests. As our staff returns from evacuation we will reduce the backlog. All previous quotation requests have been accumulated in our queue and will be processed as soon as soon as possible.
Please contact us at info@airscience.com as usual; this address is being continuously monitored.
Thanks for your patience and understanding during this event.
Attention Air Science Employees
Both first and second shifts should report to work on Wednesday, September 13, 2017, as soon as it is safe for you to do so. Please contact us at the numbers provided to let us know how you and your families are doing and what we can do to assist.
 
Air Science reabre miércoles, 13 de septiembre de 2017
Con el poder restaurado, nos complace anunciar que la fábrica y las oficinas de Air Science volverán a abrir el miércoles, 13 de septiembre de 2017.
Debido al huracán Irma, puede haber una respuesta retrasada en las peticiones de cotización. A medida que nuestro personal regrese de la evacuación, reduciremos la reserva. Todas las peticiones de cotización anteriores se han acumulado en nuestra cola y se procesan lo antes posible.
Comuníquese con nosotros en info@airscience.com como de costumbre; esta dirección será monitoreada continuamente.
Gracias por su comprensión a medida que nos recuperamos de la tormenta.
Atención a los empleados de Air Science
Tanto los turnos primero como segundo deben reportarse al trabajo en miércoles, 13 de septiembre de 2017, tan pronto como sea seguro para usted hacerlo. Contáctenos en los números proporcionados para hacernos saber cómo usted y sus familias están haciendo y qué podemos hacer para ayudar.
Due to Hurricane Irma, there may be a delayed response on quote requests. The Air Science office is open with staff on site as they return from evacuation. Please contact us at info@airscience.com as usual; this address will be monitored continuously. We thank you for your understanding as we recover from the storm.
Debido al huracán Irma, puede haber una respuesta retrasada en las peticiones de cotización. La oficina de Air Science está abierta con el personal en el sitio a medida que regresan de la evacuación. Comuníquese con nosotros en info@airscience.com como de costumbre; esta dirección será monitoreada continuamente. Gracias por su comprensión a medida que nos recuperamos de la tormenta.
We're back. At Air Science, our experience with Hurricane Irma was a challenge for all of us, both personally and professionally. Thankfully, we are back on the job and working hard to catch up.
While our quotations and administrative systems remained in operation during the storm, our manufacturing and shipping functions were temporarily suspended. These have now been restored.
On behalf of all of us at Air Science, we thank you for your thoughts and prayers, your patience and understanding, and most of all, your continued confidence in our company, our products and our services.
Paul Chambre
 
Estamos de vuelta. En Air Science, nuestra experiencia con el huracán Irma fue un reto para todos nosotros, tanto personal como profesionalmente. Afortunadamente, estamos de vuelta en el trabajo y trabajando duro para ponernos al día.
Mientras nuestros peticiones de cotización y sistemas administrativos permanecían en operación durante la tormenta, nuestras funciones de fabricación y envío se suspendieron temporalmente. Estos han sido restaurados.
En nombre de todos nosotros en Air Science, le agradecemos por sus pensamientos y oraciones, su paciencia y comprensión, y sobre todo su confianza continua en nuestra empresa, nuestros productos y nuestros servicios.
Paul Chambre
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Carbon Filters

The main principle on which the filtration of gas molecules is based is the concept of adsorption.  Two main processes by which adsorption takes place are physical adsorption and chemisorption.
 
  • Physical Adsorption
    • Physical adsorption is non-specific and adsorption of the gas molecule is by diffusion (Brownian Movement) or adsorption/condensation using Van Der Waals’ forces. 
    • The gas molecules move into an empty area and diffuse into the pore. 
    • Attracted and captured in the space by the Van Der Waals’ force, the molecules penetrate into the pores, impact the walls and are trapped.
    • The number of pores present in the carbon is vast and therefore the total surface area is extremely large. 
    • The specific surface is a measure of the surface area per unit of weight, which is m2/g. 
    • Depending on the carbon is use and the type of filter, aggregate surface area is in the range if 2000m2/g.  This represents a surface area roughly equivalent to about 4 football playing fields.
  • Chemisorption
    • The physical process of adsorption is followed by chemical adsorption (chemisorption). 
    • This is a chemical reaction in which the two substances react together and the resultant chemical is trapped on the filter material. 
    • The impregnation of filter media can greatly extend the range of gases that can be removed from the air stream.

 

Adsorption Efficiency

The ability of a filter to function efficiently depends on a number of factors including temperature, humidity, residence time, filter age, evaporation rate and chemical concentration.
 
  • Temperature
    • The temperature of the gas is very important because the higher the temperature, the lower will be the adsorption capacity, especially for a gas with a low boiling point. 
    • A relatively high temperature can even generate desorption, with the filter releasing previously adsorbed gas molecules. 
    • Generally temperature must be kept below 40°C.
  • Humidity
    • Relative humidity is an important factor that can affect the efficiency of the filter. 
    • The molecules of gases with low boiling points will be less adsorbed, because the molecules of the water vapor will be adsorbed in their place, leaving less free surface in the pores for the gas molecules to impact the carbon.
    • Generally, 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 gas molecules can be adsorbed by the pores of the carbon before leaving it. 
    • This time should be as long as possible. 
    • To maximize time, filter thickness 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 hood (face velocity) must be kept at a rate sufficient to ensure containment of the fumes within the enclosure.
  • Filter Age
    • Normally the filter, if not properly stored before use, becomes less efficient with time because of “poisoning” of the charcoal due to the presence of gasses in the atmosphere, as well as the effect of humidity in the environment.
  • Evaporation Rate and Concentration
    • The rate at which the chemical is being evaporated and the concentration of chemical vapors within the enclosure will likewise impact efficiency with the higher evaporation and concentration having a negative impact on efficiency.
 

Activated carbon filters are not recommended for use:

  • where very large quantities of contaminates are produced, such as in acid digestions or evaporation of solvents to dryness,
  • where very highly toxic substances are in use,
  • or where unknown reactions are carried out.
 



Carbon Filters from Air Science

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