Ethylene filtration system for a refrigerator

A refrigerator appliance defining a vertical direction, a lateral direction, and a transverse direction, the vertical, lateral, and transverse directions being mutually perpendicular, the refrigerator appliance comprising:

• a cabinet comprising a first side wall laterally spaced from a second side wall, a top wall vertically spaced above a bottom wall, and a back wall, the first side wall, second side wall, top wall, bottom wall, and back wall defining a fresh food storage chamber;
• a drawer slidably mounted within the fresh food storage chamber, the drawer comprising a plurality of walls defining a fresh food storage bin, the plurality of walls comprising a bottom wall, wherein the bottom wall of the drawer and the bottom wall of the cabinet define a space therebetween;
• a fresh food storage chamber ventilation system comprising a fan assembly fluidly coupled to an air supply vent and an air return vent, wherein the fan assembly urges an air flow along an air flow path from the supply vent to the return vent, wherein the air flow path includes the space between the bottom wall of the drawer and the bottom wall of the cabinet;
• and
• a removable air filter assembly comprising a housing and a chemisorption filter media contained in the housing, the filter assembly removably attached in the air flow path, wherein the filter assembly is spaced from the bottom wall of the cabinet such that a portion of the air flow passes between the housing and the bottom wall and a portion of the air flow passes between the housing and the drawer.