So, the point is, the measure of the air cleaner's performance is the percentage of particles removed from the air. Only air cleaners designed to clean the air down to particles of 0.1 microns, and do it consistently, are the only type you should consider if you or your family suffers from allergies, asthma, etc. Standard furnace filters are flat, fibrous filters that are only designed to trap the very largest of particles. It's readily seen when you pull them out to change them. Really, in a sense, they are there to protect your furnace from dirt and debris, NOT to protect you and your loved ones.
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