A food thickener is provided in the form of agglomerated instant starch, which contains a combination of one or more pregelatinized starches and a specific water-soluble food ingredient possessing specific surface active functionality. Through the air inlet air is forced via a filter into the interior of the housing. A spacer layer between the layers of magnetic material is of suitable dimensions to magnetically couple the magnetic layers in opposite directions. An equipment interface module is configured for wireless communication with the receiver of the at least one indoor unit and the control.