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  1. #1
    Join Date
    May 2008
    Location
    Houston
    Posts
    440

    Duct Board Question

    I am doing a microwave install for a buddy. I pulled out the old range vent to put in a new microwave. The vent pipe is just a few inches above the cabinet bottom. The microwave vent is triangle. There is nothing that will convert and bend that short. Will duct board be ok to use for this. It is above the oven.

  2. #2
    Join Date
    Sep 2005
    Location
    Atlanta GA area
    Posts
    20,896
    The major issue here would be cooking grease collecting on the ductboard... which would be a fire hazard if it ignited... or if there was a fire on the range below and the vent caught. Vents for cooking hoods and appliances should ALWAYS be metal.

    You may have to 'custom fabricate' a fitting, or cut some of the existing pipe and install a pre-made fitting.

    I would NOT use anything other than metal, and I would be careful the joints between fittings do not have any gaps.
    GA-HVAC-Tech

    Quality work at a fair price with excellent customer service!

    Romans Ch's 5-6-7-8

    2 Chronicles 7:14

  3. #3
    Join Date
    May 2008
    Location
    Houston
    Posts
    440
    Thats what I was guessing here. The opening from the microwave to the vent is so close. Ill have a buddy fabricate a metal box that I can just slip in. Safest way. Thanks

  4. #4
    Join Date
    Aug 2010
    Location
    Seattle Wa.
    Posts
    168
    never use duct board for anything

  5. #5
    Join Date
    Sep 2005
    Location
    Atlanta GA area
    Posts
    20,896
    For me, ductboard makes good return plenums in non-humid locations (never in a crawl). Easy for an attic when replacing a dedicated horizontal and adding a media filter to the new furnace.

    Personally, I never use ductboard after the air filter... just a matter of principle.
    GA-HVAC-Tech

    Quality work at a fair price with excellent customer service!

    Romans Ch's 5-6-7-8

    2 Chronicles 7:14

  6. #6
    Join Date
    Sep 2010
    Location
    LA
    Posts
    198
    Quote Originally Posted by Wolfer View Post
    I am doing a microwave install for a buddy. I pulled out the old range vent to put in a new microwave. The vent pipe is just a few inches above the cabinet bottom. The microwave vent is triangle . There is nothing that will convert and bend that short. Will duct board be ok to use for this. It is above the oven.
    NO...NO...NO...but looking at other comments you've probably already figured that out.

    You say the Microwave vent is "Triangle", did you perhaps mean rectanglular? There are adaptor fittings made to do just about anything needed.

    Mike...

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