Do you have an air circulating system that utilizes a standard fiberglass filter?
Do you have pets?
Are there smokers in the house?
Does anyone in your house suffer from allergies, asthma, or other respiratory problems?
Do you regularly clean excessive dust accumulations from you household furniture?
Do you experience headaches, nausea, burning sensation in the nose, throat, or eyes when inside the home?
Do you have “dust trials” or discoloring coming out of your air ducts?
When you last changed your furnace filter, did you see dust and dirt inside the filter housing?