Abstract: The present specification relates to a system for managing the condition of air in an enclosed environment comprising a flow path adapted to circulate a flow of air through the enclosed environment, the flow of air comprising at least one of a first portion comprising a gas comprising oxygen and a second portion comprising indoor air from the enclosed environment. The flow path selectively provides the portions. An air processing assembly is adapted to receive the flow of air. A first and a second air processing element is provided. A control system is adapted to determine the first portion of gas comprising oxygen and the second portion of indoor air from the enclosed environment and control the selectively coupling of the air processing elements to the flow path.

Abstract: The present specification relates to a system for managing the condition of air in an enclosed environment comprising a flow path adapted to circulate a flow of air through said enclosed environment, said flow of air comprising at least one of a first portion comprising a gas comprising oxygen and a second portion comprising indoor air from said enclosed environment, said flow path further comprising means for selectively providing the portions, an air processing assembly adapted to receive said flow of air, said means comprising at least a first and a second air processing element and means for selectively coupling said first and second elements to said flow path and a control system adapted to determine said first portion of gas comprising oxygen and said second portion of indoor air from said enclosed environment and control said means for selectively coupling the air processing elements to said flow path.