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National fenestration rating council

organization which measures and compares the energy performance of fenestration products

Pronunciation
/ˈnæʃənəl ˌfɛnəˈstreɪʃən ˈreɪdɪŋ ˈkaʊnsəl/
/ˈnaʃənəl ˌfɛnɪˈstreɪʃən ˈreɪtɪŋ ˈkaʊnsəl/