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Bellmouth Return sizing (ceiling return air system)

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RMERMP

RMERMP

Mechanical
Joined
Feb 22, 2016
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45
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PH
can anyone teach me how to size the bellmouth if i have 20000cfm supply air? i read the size of bellmouth should be double the size of the main return duct so that the return air will have low velocity in the ceiling. thanks
 
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Air or any fluid inlet are normally designed with bell mouth to minimize aerodynamic drag or in this case a reverse nozzle effect.
 
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