Exhaust fan through soffit--how?

[Bosun]

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

[TJanak]

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.

[Bosun]

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... (?)

[Terry]

If it's between the rafters, it's not bearing.

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