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171 posts

Master Geek

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  #2512254 25-Jun-2020 15:12
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samgdan:

afe66:


Our main bathroom fan above the shower vents directly into the roof space, but we only use the bath so not an issue.


Even if it was legal at the time, it feels to me to be a particularly stupid thing to be allowed to do.


In the deep south you can guarantee the roof space will be cold compared with the shower stall nearly all year round, which surely means the moisture will precipitate on the wood beam holding the roof up...



that is what I trying to avoid, to put the vents into the roof space.



It's perfectly safe to vent into roof space
It eliminates the risk of roof penetration
(But adds the annoyance of fan noise - with fan directly mounted on ceiling panels.)



97 posts

Master Geek


  #2512265 25-Jun-2020 15:19
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Plenty of room in the attic....i can even stand and walk there. but still not sure if it is a good idea to let the air from the shower to end there....

 

opinions please....


 
 
 
 


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Uber Geek

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  #2512274 25-Jun-2020 15:24
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concordnz: Get them to wire fan into your light switch & on a delay off timer. (Whenever the light is on the fan is running)
This is increasingly common & recommended practice in some areas.

Think of it like a Turbo Vehicle - which continuez to run on a delay even after you have turned the key off, locked it, & walked away.....

Try and get the 'fan' situated at the 'exit' rather directly attached to the ceiling - this will reduce 'fan noise'.
(& use insulated ducting - to further reduce 'fan noise')

 

That sounds annoying, especially if you have young kids who might be easy to wake. The extractor probably needs to run for 10 - 15 mins after a shower, but you don't want it to run it at all if you're say just brushing your teeth.

 

Manual fan controls are fine. We also have three lighting groups in our bathroom - ceiling, mirror, and LED strip lighting under the vanity.


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Ultimate Geek

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  #2513263 26-Jun-2020 20:59
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I think you will find that venting directly into roof space breaches the building code.



97 posts

Master Geek


  #2513266 26-Jun-2020 21:12
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larknz: I think you will find that venting directly into roof space breaches the building code.


I agree with that even if there's heaps of room at the attic.
I could potentially run a duct from one of the e house to the e other end. Maybe a 10 metres distance (only place where i can make a hole without affecting the roof)
Would a fan be strong enough to push or suck the air out?


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Ultimate Geek

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  #2513269 26-Jun-2020 21:15
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Unless you have a big duct it probably won't work. You need to look at the fan manufactures recommendations.



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Master Geek


  #2513271 26-Jun-2020 21:20
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larknz: Unless you have a big duct it probably won't work. You need to look at the fan manufactures recommendations.

I was looking into something like this, suggestions?

https://www.bunnings.co.nz/hpm-150mm-ducted-inline-fan_p8902950

 
 
 
 


337 posts

Ultimate Geek

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  #2513272 26-Jun-2020 21:26
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Here is the manual

https://hpm.com.au/app/uploads/sites/2/2018/06/hpml0865-inline-exhaust-fan-100mm-and-150mm-instruction-sheet-efil100sqwe-efil150sqwe-2.pdf

It's good for about 5m.



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Master Geek


  #2513273 26-Jun-2020 21:30
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larknz: Here is the manual

https://hpm.com.au/app/uploads/sites/2/2018/06/hpml0865-inline-exhaust-fan-100mm-and-150mm-instruction-sheet-efil100sqwe-efil150sqwe-2.pdf

It's good for about 5m.

5 metres is not enough the ducting will be around 10 metres.
Unless if there's another option i might need to get someone to make the hole in the roof 😕

337 posts

Ultimate Geek

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  #2513276 26-Jun-2020 21:45
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I would recommend that you contact a manufacturer such as Simx.co.nz to find out what is possible.



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Master Geek


  #2513278 26-Jun-2020 21:54
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larknz: I would recommend that you contact a manufacturer such as Simx.co.nz to find out what is possible.

Would do,
Alternatively i might need to install a dvs hrv and leave the bathroom door open to dry it up. Would that work?
You probably noticed I still trying to avoid making the hole in the roof.

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Ultimate Geek

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  #2513280 26-Jun-2020 22:02
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You need to get the steam out. I don't think a DVS would have sufficient air movement. Alternatively you might consider a shower dome, although I don't have any experience with them. They do say they will significantly reduce steam.



97 posts

Master Geek


  #2513281 26-Jun-2020 22:07
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larknz: You need to get the steam out. I don't think a DVS would have sufficient air movement. Alternatively you might consider a shower dome, although I don't have any experience with them. They do say they will significantly reduce steam.

I have a shower dome already, its amazing but the bathroom sometimes still smells like humidity, next steps i have in mind are smartvent and double glazing.
Thanks for the suggestions i need to check how much would cost for someone to make the hole in the roof, then compare if its worth it to spend the money there or go straight to the smartvent system.

337 posts

Ultimate Geek

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  #2513282 26-Jun-2020 22:13
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Just remember double glazing will do nothing to reduce moisture in a house, although it will help keep it warm. But a dry house will take less heating than a damp house.



97 posts

Master Geek


  #2513283 26-Jun-2020 22:16
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larknz: Just remember double glazing will do nothing to reduce moisture in a house, although it will help keep it warm. But a dry house will take less heating than a damp house.

Correct i well aware of that.
I had my questions about installing a smartvent as well but if it does help to keep the house dry (and maybe help the bathroom) i will need to start considering it.

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