Sandwich activated carbon filters are specialized air filtration devices designed to remove odors, gases, and volatile organic compounds (VOCs) from the air. These filters consist of multiple layers, with activated carbon sandwiched between other filter media. Activated carbon is a highly porous material that has been treated to make it extremely effective in adsorbing (not absorbing) a wide range of airborne contaminants.

The sandwich structure typically involves a pre-filter or pre-layer on both sides of the activated carbon layer. The pre-filter helps capture larger particles like dust and lint, preventing them from reaching and clogging the activated carbon. The central layer is the activated carbon, which is derived from natural materials like coconut shells, wood, or coal. The expanded surface area enhances the carbon's ability to adsorb molecules from the air.

Activated carbon works through adsorption, where gas molecules adhere to the surface of the carbon particles. This makes it effective in trapping and removing a variety of odors, chemicals, and pollutants from the air.

Sandwich activated carbon filters find applications in various industries and environments. They are commonly used in air purifiers, HVAC systems, industrial air treatment, and gas-phase filtration systems. One of the primary purposes of these filters is to control and eliminate odors. They are highly effective in neutralizing smells from cooking, tobacco smoke, pet odors, and other sources. Volatile organic compounds (VOCs), which can be emitted from paints, cleaning products, and various household items, are effectively captured by the activated carbon layer.