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Have you ever asked yourself what a manual volume damper (MVD) actually is? I started asking hundreds of people in the HVAC/R industry, including air-balance technicians, this question. I received the same answer from 99 percent of the people I asked: u201cA manual volume damper is a device installed in the duct to damper down the u201cair flowu201d to a specific CFM (cubic feet per minute) to either a single outlet or inlet, or a specific zone or branch line.u201d<br><br>Source: https://dticorp.com/what-is-a-manual-volume-damper/
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