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Building Science
Ducts in an Unconditioned Attic

The best place for ductwork is inside the thermal boundary of the house, not in an unconditioned, vented attic
Building Science
Designing Return Filter Grille Boxes

The key is having enough space to minimize pressure drop
Green Building Curmudgeon
Good Ducts, Bad Ducts

With ducts, it’s all about location, location, location

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Ducts in an Unconditioned Attic