FRAM Heavy Duty Cabin Air Filters feature quality construction and superior filtering technology to resist moisture and chemical aging. The high performance micron microfiber non-woven media meets OE (Original Equipment) fit and efficiency requirements. Studies show that the air inside a vehicle cab can contain more contaminants than air outside when air from traffic ahead is channeled into the HVAC system. Regular replacement of the cabin air filter increases driver comfort and reduces the volume of contaminants entering the system. Filter replacement minimizes the possibility of damage or failure.