Understanding Dust Characteristics - 08/06/2025

There are many important details to consider when choosing the correct air filter, mainly dust characteristics. Below are the dirty little details we need to know to help you choose the best filter for your application:

Particle Size: Fine dust (e.g., <1 micron, like fumes) requires high-efficiency filters like HEPA (merv 17 or better) or nanofiber (merv 15). Coarser dust (e.g., >10 microns, like wood chips) can use standard filters like polyester.
Dust Type: Abrasive dust (e.g., sandblasting) needs durable filters like spun-bond polyester. Sticky or oily dust (e.g., welding fumes) may require coated or oleophobic filters to prevent clogging. Consult your Micro Air rep for help.
Moisture Content: Wet or hygroscopic dust (e.g., food processing) needs filters resistant to moisture, like PTFE or hydrophobic materials. Light Oil mist may also be captured.
Temperature: High-temperature applications require heat-resistant filters like Nomex or fiberglass, rated for temperatures up to 500°F or more. If used with Micro Air Cartridge systems, make up air input/duct may be required to cool the air temperature before entering the dust collector.
Chemical Properties: Corrosive or chemically reactive dust may require specialized filter media, such as PTFE or treated spunbond filters.
Combustible Dust: Is your process creating combustible metal dust like aluminum or magnesium? (May need a wet collection system). Or is it dry dust such as wood, knowing the KST value is helpful.