Method and apparatus for monitoring and ensuring air quality in a building

Apparatus for transforming the air exchange charge of a space with a higher air exchange rate into the air exchange charge of a space with a lower air exchange rate, said apparatus comprising: a housing for mounting on a surface of the space higher rate of air exchange; an air inlet formed in said housing; at least one air outlet formed in said housing; a passage extending through said housing and connecting said air inlet to said at least one air outlet; a circulation fan arranged in said passage to draw air from the space with the highest air exchange rate towards said air inlet, through said passage, and return that air to the space with the highest air exchange rate through said at least one air outlet; and a filter arranged in said passage to purge harmful substances from the air that passes through said passage.</p> <p>(Automatic translation with Google Translate, without legal value)