A cluster of air filtering devices comprising at least one first air filtering device and at least one second air filtering device, wherein said filtering devices are each configured to clean air in a closed volume of air, the air filtering devices each comprise in a direction of an air flow: a. at least one air filter unit comprising an air filter arranged in a box-shaped housing; b. an air moving unit interconnected to and arranged downstream with respect to the air filter unit comprising i. a box-shaped housing with an air inlet opening configured to receive filtered air from the closed volume of air through the air filter unit and with respect to the box-shaped housing opposite an air outlet opening comprising a constriction having a smaller diameter than the diameter of the air inlet opening; ii. a fan interconnected to the air outlet opening configured to draw in the filtered air from the air filter unit into the box-shaped housing through the air inlet opening and to push the filtered air into an air distribution unit; c. the air distribution unit comprising a box-shaped housing interconnected to the fan and having at least one air vent to distribute the filtered air into the closed volume of air, characterized in that said air filtering devices are arranged in the same volume of air in a room or a hall of a building and are in communication to each other with respect to exchange of information, wherein the first air filtering device interacts with the second air filtering device in that they exchange information received from at least one sensor arrangement arranged in or interconnected to the second air filtering device and the information exchanged between the first air filtering device and the second air filtering device is exchanged directly and/or via a proxy and compared to a corresponding value in the second air filtering device and the operation state of the at least two clustered air filtering devices is adjusted with respect to the exchanged values. a. at least one air filter unit comprising an air filter arranged in a box-shaped housing; b. an air moving unit interconnected to and arranged downstream with respect to the air filter unit comprising i. a box-shaped housing with an air inlet opening configured to receive filtered air from the closed volume of air through the air filter unit and with respect to the box-shaped housing opposite an air outlet opening comprising a constriction having a smaller diameter than the diameter of the air inlet opening; ii. a fan interconnected to the air outlet opening configured to draw in the filtered air from the air filter unit into the box-shaped housing through the air inlet opening and to push the filtered air into an air distribution unit; i. a box-shaped housing with an air inlet opening configured to receive filtered air from the closed volume of air through the air filter unit and with respect to the box-shaped housing opposite an air outlet opening comprising a constriction having a smaller diameter than the diameter of the air inlet opening; ii. a fan interconnected to the air outlet opening configured to draw in the filtered air from the air filter unit into the box-shaped housing through the air inlet opening and to push the filtered air into an air distribution unit; c. the air distribution unit comprising a box-shaped housing interconnected to the fan and having at least one air vent to distribute the filtered air into the closed volume of air, characterized in that