This document outlines the purpose of the AMCA International Economizer Damper and Return Air Damper Secondary Labeling Program (SLP). The program exists to provide code and other regulatory authorities assurance that a damper found in labeled equipment that may not be easily visible meets regulatory or building code requirements. The scope includes volume control dampers used as economizer dampers and return air dampers found in various types of heating, ventilating and air conditioning (HVAC) devices. The dampers are required to be low leakage in order to perform their intended function. The devices in which these dampers are mostly found include air handling units, roof top units, etc. This document will provide the procedure by which eligible companies may obtain a license or a sublicense to place the label on their products if a duly qualified damper is used in the product.