DescriptionTUNE-S…EATR is a control and shut off damper for rectangular ducts. The air tightness of the dampers is classified as C4, tested according to EN 1751.The product is used for EATR control. Topvex SR/TR heat recovery units manufactured from 2024 are supplied with tubing installed.The product is intended for use with Topvex SR/TR sizes 60–100.DesignTUNE-S…EATR units are made from sheet steel frame and aluminium profile blades. The frame has 20 mm wide flanges or tight connection to the duct. The aerofoil blades are from extruded aluminium.The blades are equipped by rubber gaskets eliminating leakage in closed position.The blade axe are sitting in self lubricating bearings which are connected together by a cog – rod combination to ensure a smooth ratio and transition from blade to blade.