Expensive furnace filters such as HEPA filters are ... For a step up, consider a pleated filter. These have a MERV rating ...

It isn’t always all about air quality. Protecting the furnace is a filter’s primary task, and a non-pleated filter that provides plenty of airflow may be all you need. The Aqua-Flow frameless ...

Dust, pollen, smoke removal is how well a model cleared air of fine clay dust and cigarette smoke when operating at its highest speed. A model that scores well for dust removal should perform ...