This PreMax large capacity pre-filter is a replacement for those found in IQAir filtration units to control coarse and fine dust particles - removing them from the air you breathe. This filter can cover a surface area of 25 square feet and is made of mini-pleated, wet laid nonwoven glass microfiber. You won't have to worry about its effectiveness - the PreMax is 99 percent efficient at 5 microns. So why not leave a few on hand in case yours needs changing. Its relatively long lifespan means you won't have to worry about it all the time, either - this filter can last from 6 to 18 months, depending on usage.
