Stationary source emissions. Measurement of velocity and volume flowrate of gas streams in ducts Ingestion-build-239834 BS EN 50121‑3‑1:2017+A1:2019 supersedes EN
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BS EN 50121‑3‑1:2017+A1:2019 supersedes EN 50121-3-1:2015
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Stationary source emissions. Measurement of velocity and volume flowrate of gas streams in ducts Ingestion-build-239834 BS EN 50121‑3‑1:2017+A1:2019 supersedes EN
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