Pleated Cartridge Air Filter Buyer's Guide - RoboVent

Filtration efficiency refers to a filter’s ability to capture and retain particles from the air passing through it. It represents the proportion of particles (of a particular size) that the filter can remove from the air. The higher the filtration efficiency, the better the filter is at capturing smaller particles. Dust collector cartridge filters are usually rated using the MERV (Minimum Efficiency Reporting Value) rating system, which classifies filters based on their ability to capture particles in different size bands (3 to 10 microns, 1 to 3 microns, and 0.3 to 1 microns). The higher the MERV rating, the better the filter is at capturing smaller particulate. 

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Industrial cartridge air filters are usually rated between MERV 11 and MERV 15, with some as high as MERV 16. The recommended MERV rating for industrial air filtration depends on the particle size distribution (large, coarse particles vs. submicron particles) and air quality requirements for the application. 

• MERV ratings of 11-12 are suitable for larger particle sizes and less toxic applications (e.g., woodworking, manual metal grinding or cutting, abrasive blasting, non-toxic powder & bulk applications). 
• For submicron particles produced by thermal processes like welding, a cartridge filter with a MERV rating of 15 or higher is usually recommended.
• Note that as a dust cake builds on the filter media, all cartridge filters will approach a filtration efficiency of MERV 16. However, when filtering fine and potentially hazardous particulate, it is important to choose a filter that will provide an appropriate level of filtration across the entire filter life. 
• Applications with very fine submicron particulate, fumes or vapors and/or highly toxic materials may require a HEPA or activated carbon after filter. 

When choosing a MERV rating for an industrial cartridge filter, always consider the specific dust challenges of your environment. Additionally, while a higher MERV rating means better filtration efficiency, it can also result in increased airflow resistance, which can impact energy consumption and filter lifespan. Therefore, it’s essential to balance efficiency with operational costs and filter performance.

The end cap for a cartridge filter helps to ensure cartridge integrity and shape. The end cap generally has a gasket, which provides a seal within the collector, preventing any bypass of unfiltered air. The top cap may be circular, oval or another shape. Some cartridge dust collector filters also have a flange. When purchasing aftermarket replacement cartridge filters, you will need to get the exact dimensions of the flange if one is present. 

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It is important to choose the right end cap configuration for your cartridge dust collector. Common configurations include: 

• Open/Open (OO) End Caps: Both ends of the cartridge filter are open. This configuration allows air to flow through both ends.
• Open/Closed (OC or CO) End Caps: One end of the cartridge filter is open, allowing airflow, while the other end is closed, typically with a solid metal or plastic cap. It is common in many dust collector systems where air enters from one end of the cartridge and exits out the other.
• Open/Threaded (OT) End Caps: One end of the cartridge filter is open, and the other end is threaded. The threaded end allows the filter to be screwed into or onto a fixture.
• Conical: The conical cartridge filter usually tapers from a larger diameter at one end to a smaller diameter at the other.

After 15 minutes, remove the filters and use a non-abrasive brush or sponge to clean them. Rinse the filters thoroughly to remove any leftover grease and soap. You can pat them dry with a towel or set them on a drying rack to finish the cleaning process. Once dry, carefully reinstall the filters.  

Remember: charcoal filters can’t be cleaned so you’ll need to replace them per manufacturer recommendations.

Which range hood filter is best?

It all comes down to your cooking style and needs. Charcoal filters are great for home cooks who prepare light meals and don’t have ductwork in their kitchens. Those who love to stir fry and try out complex dishes will likely prefer stainless steel baffle filters. If you do a little of both, you may like a model with aluminum mesh filters. Ultimately, we recommend first selecting the range hood that suits your kitchen’s construction (i.e., ductwork or no ductwork), layout, size, and cooking habits. From there, you can compare the type of filters that come with each model and narrow down your options.

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