Ulpa Filters

ULPA Filters

ULPA stands for Ultra-Low Particulate Air. It’s defined as being 99.9995% effective in removing particles smaller than 0.12 micrometers in diameter. ULPA filters are made of spun-hooked fibers rolled into paper-like material, which is then formed into panels. The panels are often pleated to increase the surface volume of the filter without requiring a larger frame. Porosity is one of the most important considerations concerning the selection of fibers for a ULPA filter as their main goal is removing as many particulates as possible.

Measured in pores-per-linear-inch, or ppi, lower porosity signifies lesser airflow, but more filtration. Cellulose acetate, ceramic, carbon, glass fiber, cotton, and polyester are all low porosity fibers commonly used alone or in combination to create filter panels. These panels are placed into frames or housing units either by the manufacturer or, in the case of separately sold components, by the user. ULPA filters are extremely effective. But the systems that use them are specialized, and considerably more powerful than a residential air filter system.