Carbon Pleated Furnace Filters
Odour Reducing: How carbon filters work.
Carbon filtering is a method of filtering that utilizes activated carbon to get rid of contaminants, and pollutants by way of chemical absorption. The surface area of the activated carbon provides numerous bonding sites. When contaminants pass over the surface area of the carbon, they attach to the carbon itself and are trapped.
Surprisingly, a single pound of activated carbon provides a surface area of almost 1 kilometer. This carbon is normally activated with a positive charge and is designed to attract negative charged particles. Carbon filtering is often used for water purification, but is also used in air purifiers.
Activated carbon is a type of carbon that has been processed to make it very porous and has a large surface area for absorption. Due to its high degree of microporosity, a single gram of activated carbon has a surface area in excess of 500 metres.
Properties of activated carbon:
• capacity to absorb almost any type of vapor contaminant
• high capability for organic particles, particularly solvents
• absorb and retain a wide variety of chemicals
• large capacity to catalytically destroy ozone, a significant element of smog
• works well under a wide range of temperature levels and humidity conditions
• absorbs odours and chemicals efficiently in wet environments
• carrier of one material to attract and hold, or react with another substance
• inert and safe to work with
The Amount of Carbon makes a Difference.
Activated carbon adsorbs to it's available surface area. If there is no more available area left to adsorb on the carbon, it becomes diminished in its ability to be effective. Large amounts of carbon will last longer then smaller amounts as there is more surface area for absorption. Likewise, depending upon the amount of pollutants being absorbed, a small amount of carbon can be depleted much faster, making it useless. United Filter's granular activated carbon filters have a thickness of either a 18 or a 26 pound carbon bed making them long lasting and effective at removing odours and contaminants.
Density of Carbon makes a Difference.
The more contact time carbon has with a pollutant, the better chances it has to adsorb it. The thicker the carbon filter the better the adsorption. If the contaminant is forced to go through a long chain of activated carbon, its chances of being absorbed are greater. That implies that thinner and cheaper carbon filters used in the HVAC system will not be very good at removing and eliminating chemicals, fumes and odours from the air.