![]() These sensors are designed to measure the relative humidity and temperature inside the hood and will alarm if values exceed the preset maximum. To detect how the environmental factors affect the carbon filtration, AirClean Systems incorporates both a temperature and humidity sensor package into our Endeavour ™ and Independence ™ ductless fume hoods. This water vapor in the air passes through the filter, the water bonds to the carbon as well, decreasing the available space for other chemicals to bond. As chemical-containing vapors pass through the filter, so does water vapor. The relative humidity of an environment a ductless hood is placed in can impact the performance of filtration. Humidity is another environmental factor that plays a role in carbon filtration. By quickly being forced through, the retention time drops and the chemical is afforded less opportunity to interact. This pressure increases the speed at which they are traveling through the filter. Heating also adds pressure to the system by pushing vapors upward. As the chemicals spin and rotate through space, they might bounce from binding site to binding site, too excited to slow down. In cases where chemicals are being heated, kinetic energy is being added. Environment - Temperature and HumidityĬarbon filtration efficiency can also be impacted by environmental factors like temperature and humidity. This allows one filter to accomplish the task of many even on acids vapors, amines, and chemicals like formaldehyde. An impregnate is a substance that helps facilitate and boost filter capacity, acting as an intermediate to transform the troubled chemical into a more capturable species.Īt AirClean Systems, we can offer up to three layers of impregnates per filter, allowing a single carbon filter to be suitable for an array of chemicals being used. If a chemical is poorly captured, one way to boost the efficiency of the filter is by offering an impregnate. Larger chemical structures are easily captured while smaller chemicals aren't captured as well.I am frequently hungry and can't be bothered at the mall.Ultimately this analogy means two things: Smaller chemicals might act like me and pass by nearly every store, stopping only at the food court. One person may want to stop by every store and spend hours bouncing from place to place while, if you're like me, you might go straight to the food court and then home! Larger chemicals act as the friend they interact strongly with carbon and take their time moving through the filter. Think of walking through the mall with a group of friends. The larger the size of a chemical's molecular structure, the stronger the electrostatic forces are and the higher capacity a filter will have for it. Molecular size plays a large role in how well something will be captured in a carbon filter. While carbon filters can capture a wide variety of chemicals, it might come as a surprise they don't have the same capacity for every chemical. After all, we know our fridge mandates we must replace them, but why? 1. Now that we have a grip on how these filters work, let's take a look at the factors impacting how well a carbon filter works. Like Velcro or tape, as chemicals pass through the carbon, the electrostatic or Van Der Waals forces pull the passing molecules to the structure. These pores provide the perfect surface for adsorption, an electrostatic force at the molecular level. Just a single pound of activated carbon provides a surface area of 14,514,944 ft 2, more than the area of 300 football fields! The increase in surface area in these pores and caverns offers more places for chemicals and vapors to bind. These pores and caverns add a key component: surface area. Think of how heat changes a corn kernel to popcorn activation expands and creates channels within carbon. Activation can be done in several ways, including the introduction of pressure, steam, or chemicals. Once you have identified your source, you need to activate it. So how exactly does a carbon filter work and what factors impact how well it works? What is activated carbon?Ĭarbon comes from a variety of sources, like trees, coal, and even coconut shells. At AirClean Systems, our bonded carbon filters are designed and manufactured to meet your specific application needs. Well, the fridge is only the beginning carbon filters are not just used for purification of liquids but are also used to trap fumes and vapors as well. Have you ever stopped to look at the filter on your fridge and wonder, "What does this thing do, anyway?" Despite the recent explosion of water filters and activated carbon in consumer products, carbon and charcoal have been used as a purification tool for thousands of years. Are you drinking something right now? Carbon filters might just play a part in what is in your cup. ![]()
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