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  To help preservation staff in cultural institutions understand the impact of the environment on their collections, IPI developed preservation metrics to evaluate the potential risk of deterioration.  These metrics have become the cornerstone of IPI’s approach to sustainable preservation practices. IPI, along with energy-efficiency consultants Herzog/Wheeler & Associates, began work with the Library of Congress in 1998 to measure and evaluate HVAC system performance, make improvements to storage conditions and lower operating costs.  This partnership helped IPI develop sustainable preservation practices, refine a process to define optimal climates and manage dynamic environmental conditions. 

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