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Only an inch gap below interior door — is that enough to promote air return in a bedroom with a closed door?

Fabiano Pita | Posted in Mechanicals on

Contractor did not install air return in the bedrooms. There is only one large air return in the hallway.

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Replies

  1. GBA Editor
    Martin Holladay | | #1

    Fabiano,
    Q. "Only an inch gap below interior door — is that enough to promote air return in a bedroom with a closed door?"

    A. No. For more information, see Return-Air Problems.

  2. Trevor Lambert | | #2

    What is the right size gap for HRV air flow? Nominally 24cfm. I know for aesthetic reasons, 1/2" or less is preferred. Would 3/4" be a reasonable compromise, or could I get away with 1/2"? Easier to cut some more door off than add it back on.

  3. Jon R | | #3

    See below, but don't count on your door edges and room being as leaky as the ones the graph is based on.

    https://www.greenbuildingadvisor.com/question/how-much-should-doors-be-undercut-to-allow-air-movement-for-the-hrv

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