I'm running a circular 100mm vent from above a shower to an external outlet. Total distance is about 5m. Most of the run can be done in 100mm rigid plastic, however there are two corners that aren't standard angles and I need to bridge across them using flexible ducting. What are the relative merits of using plastic versus aluminium flexible ducting? The amount is so small that price isn't an issue - I want something that will give least flow resistance and last longest (it's buried inside a ceiling, so a leak would pump vapour onto the joists).
Hi lensman, Aluminium ducting is normally used where there is lots of heat like on a cooker extractor unit, because it needs to be heat resistent. Plastic is usually used for showers as it does not get hot like a kitchen extractor! Plastic would normally be used for a shower, I fitted a similar set up to yours about 10 years ago, using plastic pipe and it is still fine today! ultimatehandyman
Plastic would normally be used for a shower, I fitted a similar set up to yours about 10 years ago, using plastic pipe and it is still fine today! Thanks for the reply. My worry about plastic is that vibration might gradually tear it and start venting through the holes. Ever seen that happen?
Hi Lensman, I have never seen that happen myself, but I have only installed a few such systems. The plastic ones are very flexible and as long as the rigid piece of pipe is secured I cannot see there being a problem at all. ultimatehandyman
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