period two

Components of a VAV System

notes

Duct Design Recommendations

Keep as simple and symmetrical as possible

Locate main runs, branch runs, and terminal units above hallways or unoccupied spaces

Minimize use of flexible ductwork upstream of terminal units

Use duct lining or a duct silencer in first duct section to attenuate supply fan noise

Place balancing dampers upstream of diffusers in all noncritical branches

Reducing transitions should be several duct diameters upstream of terminal units

Figure 54

Other publications contain more complete details related to duct design, but here are a few general recommendations:

nKeep the duct layout as simple and symmetrical as possible

nPlace main duct runs and, when possible, branch runs and terminal units, above hallways and other “unoccupied” areas to ease installation and maintenance and to help attenuate the sound radiated to the occupied spaces

nLimit the use of flexible ductwork upstream of the terminal unit

nApply a duct lining or duct silencer to the first section of the duct system in order to attenuate supply fan noise

nAdd balancing dampers upstream of diffusers in all noncritical branches

nIf needed, reducing transitions should be located several duct diameters upstream of terminal units

TRG-TRC014-EN

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Trane TRG-TRC014-EN manual Duct Design Recommendations

TRG-TRC014-EN specifications

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