[hellothere123]

Installing new fans and there isn’t existing venting in attic to the outside. I’m going to install a vent on the roof and connect insulated pipe to the fans.
Two questions. Can I connect both fan vents together and into the same vent in the roof. Secondly I’ve heard you are supposed to create a “loop” in the insulated pipe. Where do I create the loop? What’s the purpose of it? I’ve heard it’s so condensation doesn’t make its way back or something. Sorry I couldn’t be more specific. A

 

[Nealtw]

Installing new fans and there isn’t existing venting in attic to the outside. I’m going to install a vent on the roof and connect insulated pipe to the fans.
Two questions. Can I connect both fan vents together and into the same vent in the roof. Secondly I’ve heard you are supposed to create a “loop” in the insulated pipe. Where do I create the loop? What’s the purpose of it? I’ve heard it’s so condensation doesn’t make its way back or something. Sorry I couldn’t be more specific. A

2 separate vents o the roof and yes, if you go straight up you will get condensation and dripping back down, it's not much so just a little sag in a pipe that will hold a teaspoon of water. It will leave and be replaced the next time you use it. Or run it longer when it is could outside.

 

[Old Thomas]

No loop, a loop will fill with water and stop the flow.

 

[hellothere123]

No loop, a loop will fill with water and stop the flow.

So no loop but don’t run it super tight. Leave a little slack. Kinda what your saying?

 

[Nealtw]

So no loop but don’t run it super tight. Leave a little slack. Kinda what your saying?

It comes off the side of the fan just leave a little laying in the ceiling before you go up.

 

[huesmann]

Unless you use stainless piping, aren't you just gonna end up rusting out?