PUREFLOW 2009 GMC Sierra 3500 HD Cabin Air Filter with HEPA and Antibacterial Technology, PC9957HX Entourage Includes four 24x36x1 MERV 11

Includes four 24x36x1 MERV 11 air filters for routine filter changes in residential HVAC systems

Includes four 14x20x1 MERV 11 air filters for routine filter changes in residential HVAC systems

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PUREFLOW 2009 GMC Sierra 3500 HD Cabin Air Filter with HEPA and Antibacterial Technology, PC9957HX Entourage Includes four 24x36x1 MERV 111st Stage: For drivers and passengers who suffer from severe allergies, PUREFLOW HEPA (High Efficiency Particulate Air) offers 99. 97% efficiency, capturing microscopic pollutants including pollen and other allergens (may result in a minor restriction to airflow). 2nd & 3rd Stage: Activated charcoal adsorbs harmful gases like carbon monoxide and sulfur dioxide. This layer is combined with baking soda to absorb bad odors. 4th Stage: Advanced