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90 posts

Master Geek

  # 2328982 3-Oct-2019 11:34
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Thanks for all the replies.. Actually what I really wanted to know was which was a better option running semi permantly.. could be on a timer.. or a controller.. Fresh air coming in or stale air extracting air out.. Maybe it could operate while they are out during the day..


And yes will put extractor in the bathroom.. will have to go in the window but no biggy... 


Cheers for all the feedback 



You can install extractors that vent through the roof cladding (not in the roof space) as well. Make sure shower extractor is wired to the light switch so they can't turn it off.

1049 posts

Uber Geek

  # 2329006 3-Oct-2019 12:26
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What you can do is get the window glazing changed to add passive ventilation strips at the top which allow a trickle of air flow through the flat. This should be enough to prevent condensation.


I'm fairly sure those in-window ventilators have latches to close them so if they don't want cold air from open windows they may object to leaving those open too. I think they're only available on New Zealand aluminium profiles without thermal breaks.



Make sure shower extractor is wired to the light switch so they can't turn it off.


There are pipe heat sensors that automatically turn an extractor on when showering. If they shower during daytime it might never be turned on otherwise!


599 posts

Ultimate Geek

  # 2329021 3-Oct-2019 12:58
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As others have said, if the healthy homes standard, requires externally ventilated extraction fans be installed in all kitchens and bathrooms (unless not reasonably practicable to retrofit and it was lawful when built). Clearly it is reasonably practical at lest for the bathrooms to install extractors as a window was mentioned which means they have an external wall.


Regardless of the legal situation, it is a good idea to have bathroom and kitchen extractors in all rentals to protect the asset. (bathroom extractors wired to run automatically).

Regarding general ventilation, another brand of single room balanced pressure ventilation that you could consider is simx. See page 153 here. They run at about $650.



539 posts

Ultimate Geek

  # 2329024 3-Oct-2019 13:07
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I used to live in such a flat. 


As I am really pedantic about moisture I would run my dehumidifier every day for several hours whilst all the rooms were unoccupied and open. 


I don't know how practical it would be, but a dehumidifier that was set up with a hose releasing water to the drain or outside, that was permanently set on a set cycle could be an option?


I mean that is what I would do personally if I lived in your flat, but of course having your tenants do that is a different kettle of fish.



1846 posts

Uber Geek

  # 2329048 3-Oct-2019 13:55
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There are a few decentralised ventilation systems on the market. One that i've seen mentioned a fair bit is the Lunos system.


You'd put one at each end of the house/flat and they'd work together to push and pull stale air out of the house while bringing in fresh air. Might be worth a look. 



A quick read suggests they're ventilation systems with a heat exchanger, suitable for a single room. Push / pull from different parts of the house wouldn't really be able to do heat exchange would it?


They do a range of products with different features which includes the ability to use several units in tandem from what I recall. The size of the flat isn't really given but I would surmise that a set of 4 (2 in, 2 out) would be more than enough and possibly just two. The OP would do well to call and ask for a rep's opinion. 

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