The higher the grade of air filter used, the less time you will spend: dusting, cleaning, washing windows, fighting colds & allergies and wasting fuel.
Grade your current air filter:
A = Electronic Air Cleaner
B = Permanent Electrostatic Air Filter
C = Pleated Media Air Filter
D = Disposable Air Filters
Here is an image of baby powder being poured through this disposable air filter. We grade this fitler with a D.
This image shows the same baby powder test using the electrostatic air filter. We grade this filter with a B+.