A method for configuring components (1a, 1b, 1c, 1d, 1e, 1f, 1g, 1h) in an air treatment system, e.g. a Heating and Ventilating Air-Conditioning (HVAC) system, said air treatment system comprising one or several components (1a-1h) being selected to be from the groups of flow control components (1a, 1b, 1c, 1d), sensor components (1e, 1f, 1g) or input control components, said components (1a-h) being connected to a central control system when the components (1a-h) are configured and the air treatment system is in use, each of said components (1a-h) being provided with an Electronic Control Unit and a transmitter and/or receiver for sending an input signal to the central control unit to be used for computing a control output command by the central control unit and/or receiving an output signal from the central control system in order to control the component associated with the respective transmitter and/or receiver, each of said components (1a-h) further being provided with an indicator connected to the associated Electronic Control Unit wherein said configuration comprises the steps of: I. PREPARATION a. Locating at least one component (1a-h) at its intended physical position in the air ventilation system, said component (1a-h) being assigned a unique component ID (cID) before or after it has been located at its intended position, the unique component ID (cID) being marked on the product to be selectively read for each component by an identifier. b. Providing an identifier with a system description of the air ventilation system including a configuration list with system location IDs (sl-ID) for components (1a-h) to be connected to the central control unit II. SELECTION PROCEDURE c. Identifying the physical location in the air ventilation system of the desired component (1a-h) to be configured and locate the identifier to be in reach for wireless communication with the desired component (1a-h) d. Using the identifier for sending an identifying signal in order to identify the desired component (1a-h), the identifying signal being an automatic reading of the marking on the component (1a-h) comprising information concerning the component ID (cID) and the Electronic Control Unit is programmed to activate the indicator so as to indicate the component has been selected by the identifier. III. CONFIGURATION e. Initiating a pairing event in which the desired component (1a-h) having its unique component ID (cID) paired with the system location ID such that the desired component (1a-h) may be recognized by the central control unit by the system location ID. I. PREPARATION a. Locating at least one component (1a-h) at its intended physical position in the air ventilation system, said component (1a-h) being assigned a unique component ID (cID) before or after it has been located at its intended position, the unique component ID (cID) being marked on the product to be selectively read for each component by an identifier. b. Providing an identifier with a system description of the air ventilation system including a configuration list with system location IDs (sl-ID) for components (1a-h) to be connected to the central control unit a. Locating at least one component (1a-h) at its intended physical position in the air ventilation system, said component (1a-h) being assigned a unique component ID (cID) before or after it has been located at its intended position, the unique component ID (cID) being marked on the product to be selectively read for each component by an identifier. b. Providing an identifier with a system description of the air ventilation system including a configuration list with system location IDs (sl-ID) for components (1a-h) to be connected to the central control unit II. SELECTION PROCEDURE c. Identifying the physical location in the air ventilation system of the desired component (1a-h) to be configured and locate the identifier to be in reach for wireless communication with the desired component (1a-h) d. Using the identifier for sending an identifying signal in order to identify the desired component (1a-h), the identifying signal being an automatic reading of the marking on the component (1a-h) comprising information concerning the component ID (cID) and the Electronic Control Unit is programmed to activate the indicator so as to indicate the component has been selected by the identifier. c. Identifying the physical location in the air ventilation system of the desired component (1a-h) to be configured and locate the identifier to be in reach for wireless communication with the desired component (1a-h) d. Using the identifier for sending an identifying signal in order to identify the desired component (1a-h), the identifying signal being an automatic reading of the marking on the component (1a-h) comprising information concerning the component ID (cID) and the Electronic Control Unit is programmed to activate the indicator so as to indicate the component has been selected by the identifier. III. CONFIGURATION e. Initiating a pairing event in which the desired component (1a-h) having its unique component ID (cID) paired with the system location ID such that the desired component (1a-h) may be recognized by the central control unit by the system location ID. e. Initiating a pairing event in which the desired component (1a-h) having its unique component ID (cID) paired with the system location ID such that the desired component (1a-h) may be recognized by the central control unit by the system location ID.