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DUCT DESIGN
3.3 Common System Layouts
Most HVAC systems are designed as Radial, Trunk & Branch, or a mixture of the two systems. Some examples of these systems are shown below.
3.3.1 Radial System
Radial Duct Systems also commonly referred to as spider configurations; generally consist of a supply plenum that is centrally located to the conditioned space. Duct runs branch off the plenum typically in a radial pattern to supply individual spaces with specific heating/cooling requirements.
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Figure 1
3.3.2 Trunk & Branch Systems
Trunk and Branch Systems consist of a main supply plenum with large diameter takeoffs to support the main supply of air flow. As the main supply ducts/extended plenums progress smaller diameter take off branches supply individual spaces with specific heating/cooling requirements. Sometimes longer trunks will need to be reduced in order to maintain proper flow rates.
Figure 2
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