MERV Score for Indoor Air Filters?

air filter

What rating should indoor air filters have?  Many intake filters don’t list the MERV rating.

The Money Pit Answer

MERV stands for Minimum Efficiency Reporting Value, and ranges from 1 up to 20.  The higher the rating, the greater a filter's effectiveness.  It generally doesn't take more than a few dollars per filter to jump several grades higher on the MERV spectrum.

I would say that, as a rule of thumb, go with a microallergen filter, which usually has a MERV score of at least 11.  However, if you want to hone in on more than just ratings, there's a whole line of Filtrete air filters that can weed out various particles depending on your intended result, such as reducing odors or allergens.