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110 posts

Master Geek

  # 993475 24-Feb-2014 17:37
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raytaylor: Right now, I have a the heat transfer fan in the halfway end, and a 12v computer case fan at the other end so i am trying to offset the heat absorption with air speed. but i think that springy pipe slows it down alot. 

I think if i replace the pipe with smooth PVC, and wrap it in pink batts, with large cable ties around the batts then it should work?
I have seen that the foam around our hot water piping is held on with fancy electrical looking tape, but a super long cable ties should be more permanent.

I have never purchased pink batts before but i would be looking at getting the oblong sheets?
We had the sheeps wool stuff blown in our attic a couple of years ago which is supposedly better than pink bats but i cant coat a pipe with it. But i see in new houses they have cut pink (yellow?) batts to fit into the rafters so I would use that

Purpose made heat transfer duct is spiral wound with a metallic finish surrounded with polyester insulation about 2cm thick.  The outer plastic covering needs to be airtight end to end because the inner duct has tiny holes in it that allows the entire duct to pressurise, maintaining an insulating air barrier as well as the polyester insulation which seems to be there just to maintain the inner pipes central position.  I believe that the majority of the insulating is the air barrier, just like a double glazed window.

If your heat transfer system does not have this double layer insulated duct, get some.  Regular single layer spiral duct is for expelling smells and water vapour from kitchens and bathrooms, not for heat transfer.  I scored tens of meters of the stuff from the dumpster outside a ventilation place, I guess they cannot be bothered with joining shorter lengths.

15024 posts

Uber Geek

  # 993483 24-Feb-2014 17:48
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Sorry, my mistake, it is Autex Greenstuf that is made from polyester.

From the installation datasheet of our IC-F rated LED down lights:
Approved: Pink Batts, Bradford Gold, InsulPro Poluyester insulation, Ecofleece, Autex Greenstuf, Earthwool, and Premier insulation.  NOT approved: Macerated paper (insul-fluf) and other loose fill as defined in NZS4246 standard is not permitted to abut or cover or be used in proximity to this luminaire and driver."

That is interesting about ecofleece, which is wool, becuase I contact another wool manufacturer some time ago about IC lights (I don't believe they use the IC-F rating anymore, it is now just IC according to one light manufacturer) and they said there's wasn't suitable for IC lights. That manufacurer must have done testing on the lights for all of those products. Who are the manufacturer of the lights, as they sound like a good product?


22336 posts

Uber Geek


  # 993694 24-Feb-2014 22:08
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Ceiling fans do nothing to get usable heat down in winter.

On turn on you get a few seconds of warm air sitting up there, then it mixes and you just have a draft of air about as cold as you had before you turned it on. Yes heaps of heat accumulates in high ceilings but its not actually that much heat stored in it.


3267 posts

Uber Geek


  # 993790 25-Feb-2014 06:11
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mattwnz: That manufacurer must have done testing on the lights for all of those products. Who are the manufacturer of the lights, as they sound like a good product?
It is a great product from an electrician in Wellington that could not find quality LED lights in NZ so he imported (and get it branded) and got it certified for NZ.  I now have 11 fittings, will be ordering another 15 soon to finish the house.  I got 14W fittings as it fits my 120mm holes.  And best of all if you are willing to wait 3-4 weeks then he will order it for you in whatever colour temperature you want.  We got 4000k which came out perfect daylight.  Every order comes with a declaration of compliance and nicely printed compliance certificate.  I think he got it tested for those insulation materials because he is in NZ so he knows what materials NZ use.  Anyone in East Acukland feel free to PM me if you want to see what it looks like.

You can never have enough Volvos!

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