AC-4 MERV 13 GeneralAire Aftermarket Replacement Filter

AirFilters.com Why is it important to have whole house filtration Indoor air pollution settles in houses with poor ventilation, and breathing these pollutants can cause or trigger asthma and allergies, and sometimes it can even lead to heart disease. Most HVAC systems have a filter to trap large airborne particulates like dust bunnies and hair to protect the system.