Blocking up flue hole... (2025 Update)

The catalog lists more items than just this type. I usually keep a stock of two each of these, for home projects.

GVH0031 5" duct cap, round, no crimp [the mating pipe has the crimp]

The cap is fairly deep, and the slightly loose fit on a crimped duct pipe isn't that tight, and it only becomes secure when the cap is fully seated. That may make it easier to pull into place from inside the house -- if the cap is fitted with a threaded rod.

But doing a good job, I would want ladder access while doing it. To do any belt-and-suspenders work on it. Doing it from inside, would keep the birds out, and that's about it. If you wanted to put caulk on it, that would be an outside job. If the duct pipe was tilted downwards, towards the outside of the dwelling, that would make certain failure modes less of an issue.

The fit of the item, is not "water tight", which is why a bead of caulk comes to mind. Only an issue if the water, plans on running into the house.

You may want to paint the cap, to take the shine off the steel.

Paul

I cannot see how plugging it from the inside will work. A lot depends on what the outer wall material is made from and what sort of finish eg render might be on the wall. It will also depend on how neat a hole was made? Was it core drilled, stitch drilled or simply chiselled out?

As a temporary method to stop ingress you could make up two PIR plugs to push into the hole with some PU foam to seal gaps and secure in place. The inner plug could be left in place seeing as it is an attic but looks like you are going to have to get someone to make a permanent job on the outside.

"Access denied" to *all* Home Depot websites (Fx, PM, and Vivaldi). Eg: "You don't have permission to access "

geo-blocked for GDPR reasons?

There are ducting kits that can be installed entirely from the inside - these are useful if you're installing air conditioning in a tower block but don't want to pay for a crane to put a duct from the outside - the unit is inside the room and you install the duct from inside. See the part marked (c) on the diagram:

Here's a folding grille of that nature:

- maybe somebody makes a solid version, or perhaps you could mount that and then seal it up from behind (foam, cement?)

Theo

I don't think so, they don't offer services to the EU so there should be no need. It seems to be a long standing issue. archive.org seems to copy it often, more than once a day so you may find what you want that way.

Dave

That’s rather clever. I might well try that. Thanks.

I dare say that grill could be blocked up easily enough.

Tim

Radiator-style air conditioners are popular in Italy, so I might have a look about amazon.it:

(Olimpia Splendid is a popular Italian brand of A/C units)

Access is possible using Tor Browser.

Copied here for convenience:

Ordered and fitted today. I bought the 125mm diameter version that fitted fine over the end of a piece of 110mm waste pipe.

It looks a little odd as a loft ventilator but it’ll do nicely until I next need to access the outside of the house for repainting maybe.

Thanks again for the heads up.

Tim