Hi,
I am replacing a 4" extractor fan in the ceiling of a bathroom. The last one was damaged due to water (condensation) coming into the fan from the ducting in the attic. This ducting is positioned almost vertically for 3 feet and then goes into a horizontal pipe which eventually goes out the roof via a roof tile.
I bought a new fan and in the instructions it mentions about installing a condensation trap if the ducting is been installed above the fan. Will this prevent the water/condensation coming back down into the fan?
Another alternative is I could get new ducting and run it across some of the attic floor. Then I could leave it open into the attic. Is this ok or would it build up moisture/dampness in the attic?
Any suggestions would be appreciated.