Energy efficiency measure proprietary system EEM
PAS 2035:2023 (Incorporating Corrigendum No.1) Retrofitting dwellings for improved energy efficiency – Specification and guidance published in August 2024 defines an Energy Efficiency Measure (EEM) proprietary system as a "combination of products and materials together with any related installation method, design detailing, equipment requirements and performance objectives, placed on the market exclusively by a specific supplier, for installation in existing buildings for the purpose of enhancing the energy efficiency of those buildings"
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