Tosh

Don't think there's any requirement to box in, just need to maintain distance to combustibles. I think you can get the aesthetics for the firestop and vent like so

or these https://www.google.com/search?q=dura+flash+flue&oq=dura+flash+flue&gs_lcrp=EgZjaHJvbWUyBggAEEUYOTIGCAEQRRg8MgYIAhBFGDzSAQoyMzk0NGowajE1qAIIsAIB&sourceid=chrome&ie=UTF-8

Dektite grommets for the external seal, as bove. Red and black rated for different temperatures I believe, red is higher. Between floors https://flexibleflueliners.com/product/ventilated-fire-stop-plate-150mm-black-kw-pro/?campaignid=21800739722&adgroupid=170161215993&keyword=&device=c&gad_source=1&gclid=Cj0KCQjwsoe5BhDiARIsAOXVoUtXOpIrQ9KMOILyf_RY0p1j_2_D0fXFubmpHBBOahnBZD0bY_YNHKEaAq2TEALw_wcB

I'd be inclined to contact your local fire officer, they're usually very helpful.

We have Norrsken, supply only. We found the price mid range, most things become a balance of quality v cost but we've been really happy with them, well mostly. The timber and alu clad were beautifully finished, the hinge mechanisms lovely and smooth in operation. Pre-sales were very helpful, communications up to and including delivery really good. Not so good - The window handles are cheap. The moulded plastic coating has broke on one of them already. I can't remember if they offered the option but I'd go for something more robust. Installation support, typical drawings, etc were non existent. I really had to push to get information and what I got was very, very basic. This wasn't a big issue for us personally but may be for others. Would I choose them again, absolutely.

I don't think there's any need to leave it at 6bar, it's really just to test the joints above their normal operating pressure. I dropped ours down to 1.5 bar when they poured the screed and just monitored it. It went up to 4bar shortly after pour then dropped back down to 1.5 after a few days if I recall.

Yes I have it Russ, plus the stapler as well If passing anywhere near Hereford can meet up or post.

Lol, too late in life for that...

Likewise, I prefer to keep the wood fresh looking.

Be aware that this will still silver. Vastern have weathered panels on display outside.

I used Plasson throughout our 32mm supply, sourced via JDP as well. That Plasson stoptap in your picture has been in my plant room under 10-12bar pressure for over 2 yrs and no issues.

If you're set on buying from abroad then some of the Polish manufacturers may be worth a look, debesto, fenbro, etc. Debesto certainly have a wider range of brands.

I had some samples of Ayous, thermally modified, and liked the look of it but wow is it brittle and it also marked very easily. The grain pattern didn't really suit the look we were after in the end but that's a personal thing. It was a reasonbale price circa £6.50/lm if I recall. We ended up going for cladding from Norclad. Its A+ GRADE Brunnea treated Redwood, very few knots. And as its treated it's not as brittle as some of the thermally modified stuff. I'm sure there's some info on Norclad site about additional fire treatment as well. Note Norclad are part of Arnold Laver now who are in turn under the National Timber Group. The reason I mention this is if you wanted to use Norclad then your BM may have accounts with AL and/or NTG so you might be able to negotiate a better deal.

Hammer tacker

Similar to others we just used 35mm metal boxes, which work nice with 25mm batten and 12.5 pb, screwed to webs.