Check out your furnace’s air filtration systems. Some homes may still have 1” or 2” simple filter systems that may or may not be loose fitting, poor designs or even some have eliminated filters over the years.
We always prefer to use electrostatically charged media to strain airborne particles as small as .3 micron with a 95% efficiency rating (using Merv.16 and Merv. 11 based on home conditions).
Media Air Cleaner, 20 x 25, MERV 11 x 5” wide filter rack system or Lennox Healthy Climate Media Air Cleaner or Clean Comfort Solutions Model AM11-2025-FC
Filter Efficiency: MERV MERV MERV! MERV is the standard rating system accepted by The American Society of Heating Refrigeration and Air Conditioning Engineers (ASHRAE) and the air filter industry. This numbering system captivates a system enabling consumers to evaluate and compare mechanical air filters for overall effectiveness in removing airborne particulates. In the most simplified explanation, the higher the MERV rating, the greater the efficiency in removing contaminants and pollutants. Merv 10 is typical for a normal household. However, if anyone in your home has allergies, asthma or any other respiratory conditions, pets or if you live in a dusty environment you should aim for a MERV 12 or higher rating.