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Sqaur diffuser plenum sizing

123131415

Mechanical
Joined
Nov 13, 2006
Messages
20
Location
IN
Dear member,

I am working with project wherein square diffuser is supplied by other vendor/manufacture and plenum box above diffuser is supplied by duct manufacture. Plenum box is suppled though the thermally flexible duct which served by CAV/VAV.

Diffuser schedule

Neck size flow

150 x 150 50L/S

225 X 225 51-100 L/S

300 X 300 101-190 L/S

375 X 375 191-300 L/S

My problem is

1). How to size the plenum box for each diffuser.

2) spigot size i.e inlet size to the plenum box for flexible duct connection.

Thank you.
 
My recollection tis the ASHRAE handbooks have practical information about plenum sizing and much much more.
 

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