Bedroom Pressurization
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Return Ducts for Forced-Air Systems
A fresh look at door undercuts, jumper ducts, and transfer grilles
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Grilles, Registers, and Diffusers Part 2: Return Air Pathways
Solutions to avoid pressurization problems related to closed interior doors
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Door Undercuts for Return Air
You don’t always need to install individual returns, transfer grilles, or jumper ducts