#887
stevie
Participant

I used the largest size they have.  

Also, haven’t mounted these yet, and may only use one of the pair purchased:  https://www.amazon.com/Mr-Auction-Brass-Clamshell-Cover/dp/B00OTZOM1A/ref=sr_1_sc_1?ie=UTF8&qid=1497234949&sr=8-1-spell&keywords=clamsehll+vent+brass

They’re not brass, but instead are cast iron.  Probably salvaged from a ship.  I’ll paint a complimenting (or contrasting) color and most likely mount on transom.  

Even with the largest clamshell iboats.com has, the openings can’t keep up with the exhaust fan.  I suspect the mushrooms vents don’t either, unless two pairs are installed.

Perhaps I should stress is that these clamshell vents must be mounted on flat surfaces.  They will not adapt to curvatures. 

  • This reply was modified 3 years, 10 months ago by stevie.
  • This reply was modified 3 years, 10 months ago by stevie.