A system for preserving perishable items in a sealable container may include a nitrous oxide filter engageable with the sealable container. The nitrous oxide filter may include an expansion/settling chamber, an adapter coupling operatively attached to an inlet of the expansion/settling chamber, a nozzle attached to an outlet of the expansion/settling chamber, and a filter media positioned with the expansion/settling chamber, wherein the filter adapter is configured to engage with an exit nozzle on an existing nitrous oxide cartridge system.

A refrigerator appliance comprising a fresh food storage chamber and a filter system for ethylene in the fresh food storage chamber is disclosed. The fresh food storage chamber includes a ventilation system comprising a fan assembly fluidly coupled to an air supply vent and an air return vent to urge an air flow along an air flow path. A removable air filter assembly for ethylene gas, the filter assembly including a housing and a chemisorption filter contained in the housing, is removably fixed in the air flow path.

A refrigerator appliance comprising a fresh food storage chamber and a filter system for ethylene in the fresh food storage chamber is disclosed. The fresh food storage chamber includes a ventilation system comprising a fan assembly fluidly coupled to an air supply vent and an air return vent to urge an air flow along an air flow path. A removable air filter assembly for ethylene gas, the filter assembly including a housing and a chemisorption filter contained in the housing, is removably fixed in the air flow path.