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SysTech Lo-Noise Passive Exhaust Modules Twelve (12) Lo-Noise™ Passive Exhaust Modules located at a Marcellus Extraction and Transmission facility in New York. Each roof mounted unit featured a weather hood with acoustical liner and a three foot silencer to mitigate internally generated noise. Total exhaust airflow – 384,000 CFM, Noise Criteria – 40 dBA at 50’.

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