New cabinets, new over-the-range microwave, old 7" duct from the previous range hood — but the microwave exhaust adapter doesn't quite line up with the duct, and the distance is pretty short:

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What would you do here?

  • The shortest rigid adjustable elbow I've found would require cutting the vent about flush with the top of the cabinet, and getting the exact fit in-place seems like it would be tough.
  • Maybe I could cut away a bit less length and use a flexible connection?
  • Just start calling local HVAC places or a handyman? Am I just asking for trouble?
  • 1
    Do you plan to leave it installed with that extension cord?
    – KMJ
    Commented Jan 8, 2023 at 9:07

2 Answers 2


I see no reason you couldn't use a short length of 7" flexible duct. Obviously, a long flex is a bad idea because it restricts flow, but for that few-inch offset, flex will do you fine.


Flex does not meet code so don't. It would not do to have a fire and realize your homeowners insurance wouldn't cover the losses because you didn't install per code.

  • 3
    You probably should be a fair bit more specific when talking about whether stuff does or doesn't meet Code -- really helps to actually cite the Code section you're talking about (in your case, IMC 505.3, which simply requires the duct to be made from metal and have a smooth inner wall, something that is available in flex these days albeit not typical) Commented Nov 19, 2023 at 6:37

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