Kitchen Extractor Duct in Ceiling Void

Discussion in 'Builders' Talk' started by Jimbo, Jul 9, 2021.

  1. Jimbo

    Jimbo Screwfix Select

    Is it allowed to run the ducting for a kitchen extractor through the void between the ceiling and the upstairs floor boards?

    If so, should a particular type of duct be used in this scenario?

    Many thanks!
     
  2. Tilt

    Tilt Active Member

    So long as the extraction police aren't notified........... go for it, Lol. :)
     
  3. FlyByNight

    FlyByNight Well-Known Member

    Why do you think it cannot be run there?
     
  4. candoabitofmoststuff

    candoabitofmoststuff Screwfix Select

    I can't give a 100% positive answer.... but I have extractor duct for an understairs toilet in the void between garage ceiling and upstairs floor... The extraction was required by building control, and they were perfectly satisfied with the route. I can't really see you have a different situation.
    Mind you, this approval was given 17 years ago!

    Good luck,

    Cando
     
  5. Jimbo

    Jimbo Screwfix Select

    Thanks for the replies.

    I was think about fire control. There would be a large hole in the kitchen ceiling for the ceiling hood, and then a tube lined with nice combustible grease residues in the void itself.
     
  6. The Happy Builder

    The Happy Builder Screwfix Select

    4” soil pipe.
     
  7. Bob Rathbone

    Bob Rathbone Screwfix Select

    With a slow fall to outside for moisture drainage, and if you are concerned at fire spread, fit an intumescent fire trap at the cooker end.
     
    Jimbo likes this.
  8. candoabitofmoststuff

    candoabitofmoststuff Screwfix Select

    Good thinking!
    Cando
     
  9. FlyByNight

    FlyByNight Well-Known Member

    And maybe use te flexi metal tube/line instead of plastic.
     
    Jimbo likes this.
  10. Jimbo

    Jimbo Screwfix Select

    Thanks for the replies. The fire shutter in the duct is a great idea, together with flexible fire rated aluminium ducting I feel much more comfortable about it.
     

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