The Aprilaire 1310 filters over 19.4 square feet of your house at any one time. This highly effective Aprilaire air cleaner can remove pollen, dust, pet dander, smoke and other irritants that flow freely in the air. It uses a SelfSeal system which prevents unfiltered air from going through the unit. Built for many different applications, this Aprilaire 1310 air purifier is versatile and compatible with almost any home setup. This Aprilaire whole house air purifier comes from the 1000 series. This line comes standard with an Aprilaire 310 MERV 11 filter. This filter can be replaced with an Aprilaire 313 MERV 13 filter, which removes even more contaminants from the air. This line of air purifiers is designed to have little restriction to the house's airflow system. The filter itself has a large surface area, which helps it last up to a year. Filters are recommended to be replaced about once a year and can be replaced by wither the MERV 11 or MERV 13 models. Replacing the filter is fast and simple, as well.