There have been available, for many years, ducted home ventilation systems for moisture reduction which get the dryer roof cavity air into the living spaces to dilute the wetter air in those living spaces. These systems use ducting to each room vent, a central fan (sometimes two), a central filter (sometimes two) and a complex expensive controller. Has anyone heard about a new ductless system now available in New Zealand which is called unovent? It has no ducting or central fan and filter but has an individual fan and filter mounted in the room vent and costs about a third the price of a ducted system.
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Time to re-visit ventilation for moisture reduction
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What are the installation costs like?
I'm guessing you need power run to every fan, rather than one central fan which will add a bit to the price.
Also, check the servicing costs, HRV filters get FILTHY and need regular replacement, it might cost more to replace a dozen or more filters, than 2 filters like in a centrally ducted system.
I can't see why it wouldn't do the same job as HRV and the rest though, could be worth a look if it is as cheap as it seems.
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We are not permitted to use links but if you Google search unovent and use the com one about three down your queries would be addressed. My understanding is that extractor fan systems are rapid air removal devices for service rooms ( kitchen, bathroom, toilet, laundry, etc) where a lot of water and/or odours are put into the air as well as heat of course. They would be switched on for short periods. Ventilation for moisture reduction is something different utilising available dryer air from the roof cavity to reduce the water content 24/7 in the living spaces (bedrooms, lounge, living room, dining room, family room, etc).
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Don't the HRV/DVS systems rely on creation of "positive pressure" which is achieved when the system is on as all fans operate at the same time. In order for the same thing to occur you'd need to turn each room's fan on at the same time, otherwise rather than positive pressure you'd just be shifting the air from the room-with-fan-on to the room-with-fan-off.
Reminds me of Reece Witherspoon versus Reece Withouterspoon.
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Originally posted by Leftette View PostDon't the HRV/DVS systems rely on creation of "positive pressure" which is achieved when the system is on as all fans operate at the same time. In order for the same thing to occur you'd need to turn each room's fan on at the same time, otherwise rather than positive pressure you'd just be shifting the air from the room-with-fan-on to the room-with-fan-off.
Reminds me of Reece Witherspoon versus Reece Withouterspoon.
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I remember reading somewhere that anything which shifts air from the roof space into the main part of the house is a bad idea, as roof spaces tend to be full of dust, tiny horrible bits of insulation, etc. Ordinary moisture problems (bathroom, kitchen) can usually be solved with a decent extractor fan. Moisture problems that go beyond this need something more fundamental than shifting air around.
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Originally posted by Maccachic View PostWhy not heard of double catches / security latches? I don't see the point paying to fix a problem which is solved easily.
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