The Dynamo is our best 1” filter. It uses patented design and patented electronic technology to trap airborne contaminants like dust including dust mite feces, dander and pollen. The Dynamo will effectively trap particles as small as .001 microns in size. Even the best pleated filters cannot do this. Our filters also catch things like bacteria, viruses, smoke of all kinds (tobacco, automotive, cooking, fireplace) and most heavy metal particles including those created through radon decay processes.