<http://schema.org/description>
"Let's take a moment to talk about your furnace filters. You know you need to swap them out more frequently than you change swap out your standard air purifier filters. That's because there's a lot more air that gets pushed through these filters. With this increased amount of air comes a larger amount of debris. Thankfully, these filters are rated MERV 11, which means they're some of the best residential filters available. Just make sure to inspect them monthly (give them a once over with the dusting brush on your vacuum if they look dirty) and then replace them completely every three months.\r\rDesigned for Household Forced Air Furnaces\rRated MERV-11\rApproximate Dimensions: 21\" x 23\" x 1\"\rAbsolutely Essential for Allergy Sufferers\rDesigned and Engineered by Think Crucial\r"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.thinkcrucial.com/products/6-merv-11-allergen-air-furnace-filter-21x23x1>