Do Carbon Filters Need a Pre-Filter?

The pre-filter is the first line of defense against dust and debris that can clog the pores of the carbon filter. Replacement pre-filters can help extend the life of the carbon filter, as they have very low air resistance and are easy to change. They block dust and other contaminants from entering the filter. Pre-filters are standard, while charcoal filters are optional. If pre-filters are not used, the life of the primary filter decreases and the air cleaner requires more frequent maintenance.

This is because the pre-filter traps larger particles before they have a chance to penetrate deeper into the system and create blockages. This carbon pre-filter can be cut to fit your air purifier, and is designed to reduce common odors such as smoke, cooking, and pets. It's a good idea to replace the pre-filter when it gets dirty. A dirty pre-filter increases pressure drop, reducing airflow through the filter. A clean pre-installed filter will also extend the life of the filter and make it more effective.

This ensures that the charcoal filter properly traps odors in the activated carbon and refines the air when used with an in-line duct fan. Activated carbon filters work differently than other types of filters. Instead of absorbing molecules (think about how a sponge absorbs water), carbon filters attract molecules to stick to the outside of the filter (think about how a lint roller grabs hair and lint). If your air purifier uses a replaceable pre-filter, it will be much cheaper than replacing the HEPA filter. The HEPA filter of an air purifier is effective at removing microscopic particles such as smog and smoke. Most air purifiers come with pre-filters, so it's likely that your air purifier already has one.

The useful life of a filter is determined by the concentration of the pollutant, the relative humidity, and the volume of air being cleaned. Once the gasket tape is installed, center the flange on top of the filter and use 6 tek screws to secure it to the top of the filter. As a first line of defense, they filter out a lot of particles before they reach the HEPA filter. Each different filter size provides a different resistance for each different size and style of fan placed on it; a filter with maximum exhaust CFM rating is approximately 0.7 wg. These specialized filters are made of carbon material that attracts stinky gaseous molecules, causing them to stick to its surface. The first and most pressing sign that you need a charcoal filter is if you are trying to remove odors from the air.

Filter technology based on several levels of filtration, such as those using pre-filters, is often more efficient at removing particles because they keep them inside rather than releasing them back into the air. If you are a smoker or your house has unwanted odors, an activated carbon filter is an ideal “accessory” for an air purifier. A coated filter designed to extend the life of the carbon filter by preventing debris from entering its bed can also be used.