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Why do the measured air velocity values in the AFPD chart increase as they get farther away from the diffuser?

April 26, 2017afpd air away chart diffuser farther increase measured values velocity

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Why do the measured air velocity values in the AFPD chart increase as they get farther away from the diffuser?

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This phenomenon is caused by temperature difference in the supply air and the room air. When cold air enters the room its velocity will increase slightly until it warms to room temperature.