Exhaust fan through soffit--how?

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by Bosun, Jan 18, 2010.

  1. Bosun

    Bosun New Member

    Messages:
    89
    Location:
    Minneapolis
    Hi--I have a clay tile roof, so I will need to go through the small attic to the soffit, andf vent out the bottom of the soffit. Will I need to use a hole saw to get though the board where the house supports the roof?

    1924 house, concerned about this install. I realize this post might be misplaced, but I can't seem to find a bath-fan forum anywhere!

    bosun
  2. TJanak

    TJanak New Member

    Messages:
    154
    Location:
    South TX
    I used 3" rigid metal duct for the whole run except for going between the roof and the top plate on the wall. In that 1' length I used flex because the opening was almost 3" tall but you need to make an immediate turn down to the soffit. I would not cut into the plate. I even tried to use a metal elbow but it would not quite fit and you can't squeeze them without failure. Not sure how yours looks though.
  3. Bosun

    Bosun New Member

    Messages:
    89
    Location:
    Minneapolis
    Yep--same sort of space betwen the top plate and the space betwen the roof rafters. I tried peeking up into the soffit yesterday by removing one of the exterior vents. full of insulation... (?)
  4. Terry

    Terry Administrator Staff Member

    Messages:
    15,038
    Location:
    Bothell, Washington
    If it's between the rafters, it's not bearing.

    You should be able to cut a hole for the bath vent.
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