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Thread: Ducting Insulation
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22nd Jul 2020, 10:54 AM #16Most Valued Member
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as your ducting should have been next size up at minimum, no need to measure pa as we know fan and duct are not matched. Yo aint going to get any better without changing it out.
A visual inspection and feel will pick up a collapsed duct.
A smoke test will tell if you have any air leaks but it will stink the house out...so best to just make sure all duct joints are taped properly...quicker as well ...so up in the roof you go if you havent allready done that .
A s you say no need for that 90 bend...just tape it up if your concerned its a tad restrictive...doesnt look like it from you pic
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22nd Jul 2020, 10:49 PM #17Most Valued Member
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We do?
While you do, I sure don't.
Are you saying because of the length of the run it would be normal practice to leave the fan at 200mm and go up a duct size?
Will do.
SWMBO picked up a roll of insulation on the way home. Was up there this evening. Got the insulation rolled out over the trusts, just need to slide it under and tape it up tomorrow.
Good time of year to be up in the roof.
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23rd Jul 2020, 11:43 AM #18Most Valued Member
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23rd Jul 2020, 11:41 PM #19Most Valued Member
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It turns out what I thought would be the hard part, unrolling the insulation, getting it through the trusses and around the duct, was easy part. What I thought would be the easy part turned out to be pretty painful... taping it up. So while there is a fair overlap it currently only has a piece of tape across the joint every 450mm and the ends are tied closed with string! lol
Turns out there is 12m of 200mm duct. So there is still that and the 150mm ducts without added insulation.
The early results look better than expected. I'm getting about an 8C temp increase. With the same fan temp the outlet temp has gone from 33C to 41C. With an inlet temp of 17C that's a 50% increase in heat. Still losing about 19C. There is some wiggle room in those figures, took awhile to get a stable fire going this evening. I likely would have been happy with that, so would seem worth getting another roll and finishing it off.
Well expect some question if I ever get around to added another outlet. While I have you here, The ducting is run through the roof trusses(wood, 900mm centers), so sits near the bottom of the Vee between the king post and truss web(yes I had to look that up https://www.carpentry-pro-framer.com...roof-truss.png). Would it be worth using so blue tape to make a bit of a cradle? or am I over thinking things? lol
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24th Jul 2020, 02:40 AM #20I break stuff...
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24th Jul 2020, 10:46 AM #21Most Valued Member
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24th Jul 2020, 02:56 PM #22
Who Knew?
Guy_With_A_Problem: Guys, I have a problem. My thing isn’t performing properly. I’m thinking about some cheap, amateur ways of bodging it up.
Guy_Who_Knows_What_He’s_Talking _About: Yep, your thing is too small and not up to the correct spec. Get a bigger, better one.
Guy_With_A_Problem: I’ve bodged it up proper.
Guy_Who_Knows_What_He’s_Talking _About: Look out for problems.
Guy_With_A_Problem: Couldn’t be happier, I’ve measured a tiny improvement.
Guy_Who_Knows_What_He’s_Talking _About: OK.
Guy_With_A_Problem: I’m a Legend!
Everyone Else: Who knew this would happen?
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25th Jul 2020, 12:14 AM #23Most Valued Member
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Anyone seen a bridge missing its troll? I think I've found it.
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25th Jul 2020, 12:18 AM #24Most Valued Member
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26th Jul 2020, 11:08 AM #25Most Valued Member
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26th Jul 2020, 05:42 PM #26Most Valued Member
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I worked with a guy that used to do installs. He told stories about houses so low you started at the "door" with a spade with the handle cut down and dug your way in from there. This would have been in the days of the aluminium ducting(no idea what it was called) so even more painful I assume than the springy stuff.
Of course, maybe thats one of those stories that gets repeated.Last edited by Stustoys; 26th Jul 2020 at 11:12 PM. Reason: -went
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26th Jul 2020, 08:19 PM #27Most Valued Member
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[QUOTE=Stustoys;1972042]I worked with a guy that used to do installs. He told stories about houses so low you started at the "door" with a spade with the handle cut down and went dug your way in from there. This would have been in the days of the aluminium ducting(no idea what it was called) so even more painful I assume than the springy stuff.
Of course, maybe thats one of those stories that gets repeated.[/QUOT
Cant think of the correct name but I call it ductboard...
A compressed insulation that has a outer liner of very heavy silver foil...similar to polystyrene board.
But the main lenths were made up off site, and finer ducting alterstions and making of smaller stuff was done on site...usually in the the freekin hot ceiling space...
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