I have been reading through the posts on shower extractor fans and I have worked out that I probably need to vent through the roof via the loft space.
My plan is to exit the roof, which is pitched and tiled, using a 4-inch solid duct that will pass vertically through an angled sealing cone and plate and will be capped with a roof cowl. I am thinking of incorporating into the system an in-line fan that will be connected with flexible ducting to the ceiling grill in the bathroom on one side and the roof on the other. I have read that in-line fan systems are much quieter, but this option might be problematic as I want to run primarily via a humidity sensor (see below).
Questions:
Where can I buy a stand-alone humidity sensor that will fit into the ceiling and will control the in-line fan? Is it best to buy an in-line fan and sensor package, if such a thing exists?
Do I need to fit a condensation trap?
If I do, I assume that this must be fitted at the lowest point in the system after the in-line fan? Can you purchase right angled bends (for 4 inch solid ducts) with condensation traps? If you can and a trap is needed, I would fit at end of vertical drop from roof. I assume that the ducts should also be lagged.
Any advice will be appreciated.
My plan is to exit the roof, which is pitched and tiled, using a 4-inch solid duct that will pass vertically through an angled sealing cone and plate and will be capped with a roof cowl. I am thinking of incorporating into the system an in-line fan that will be connected with flexible ducting to the ceiling grill in the bathroom on one side and the roof on the other. I have read that in-line fan systems are much quieter, but this option might be problematic as I want to run primarily via a humidity sensor (see below).
Questions:
Where can I buy a stand-alone humidity sensor that will fit into the ceiling and will control the in-line fan? Is it best to buy an in-line fan and sensor package, if such a thing exists?
Do I need to fit a condensation trap?
If I do, I assume that this must be fitted at the lowest point in the system after the in-line fan? Can you purchase right angled bends (for 4 inch solid ducts) with condensation traps? If you can and a trap is needed, I would fit at end of vertical drop from roof. I assume that the ducts should also be lagged.
Any advice will be appreciated.