The complete source for building, designing, and remodeling green homes

Building Science
Door Undercuts for Return Air

You don’t always need to install individual returns, transfer grilles, or jumper ducts
Building Science
An Easy Retrofit for Return Air

For homes without dedicated return grilles in the bedrooms, this easy-to-install device provides a return air pathway
Musings of an Energy Nerd
Return-Air Problems

What happens when the bedroom doors are closed

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Door Undercuts for Return Air