There are many types of air filters available. These filters are classified according to their filtration efficiency, based on their MERV rating. Some types of MERV filters are made from paper or pleated cloth, which gives them more surface area to capture particles. The best standard filters for capturing very small particles are MERV 13 air filters.

merv 13

Interception

The interception stage is where the airborne particles are captured. This stage is very similar to inertial impingement, but there is one key difference. Interception involves airborne particles coming into contact with filter fibres. The media is able to adhere to them through molecular interactions. This process is most efficient when particles are small in size and move at low velocity. This stage is most efficient when air filters are made from low-velocity extended media.

Dust particles that are large enough to penetrate filter media will bind to the interception portion of the filter. Medium-sized particles can follow the media fibers but may veer off track due to their inertia. The filter fibers will catch smaller particles, but they will not be able to pass without contact. The result is that particles will be trapped. This is how air filters work. Air filters work by interception.

Diffusion

Diffusion of air filters can be used to capture dust particles smaller than the filter’s media fibers. This occurs when a particle’s random Brownian movement interacts with the filter fibers. The interaction between the particle, the fibre and the filter media creates a lower level of particles within the media. This attracts other particles. This type of filter operates with low media velocities and high concentrations of micro-fine fibers. The more time a particle spends in “capture zone”, the more likely it will be captured by the filter.

When particle density is low, the filter’s efficiency is high. The MPPS for highly dispersed particles will range from 40 to 100 nm. The same principle applies to air filters made of charged synthetic fibers. The filtration speed is what determines the impact of particle density on filters. The filter’s efficiency will be lower if the initial concentration is higher. This is why the Peclet number matters.

Electrostatic

Unlike traditional air filters, electrostatic air filters don’t require much maintenance. You can wipe them down with a microfiber cloth or disposable wipes monthly. However, this type of filter isn’t completely maintenance free. A maintenance kit that includes a filter cleaning brush, replacement cartridges, and a maintenance kit is a good investment. Maintenance is easy and can be paid for in a matter of months.

An electrostatic air filter can help you reduce your utility bills. An HVAC system’s efficiency can be reduced by as much as 15% if it has a dirty filter. This happens because dirty filters have clogged pores, which prevent heated air from passing through. Electrostatic air filters do not have pores, which can help to reduce energy bills. Combining annual tune-ups with electrostatic air filters can help you save money on utilities and energy bills.

Pleated-paper

Pleated-paper air filters are among the most popular kinds of home air filters. They allow air to flow through their fine pores. They are usually made of synthetic or cellulose fibers. They are often used in automobile air cleaners, furnace filters, and indoor air purifiers. They are more affordable than paper filters and are easier to clean. They also offer a lot of filtration space.

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