07 18:28:01Until today we had a standard condensing boiler with a
coaxial flue.

Now we have a hole in our gable wall that I'd like to block up.
The problem is, the boiler was in the attic of a two story house
and even if I had a ladder that would reach, I wouldn't like to
work at that height.

This must be a fairly common issue. What's the easiest solution?
Some sort of plug that can be inserted from the inside?


Tim
--

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On Mon, 4/7/2025 2:10 PM, tim+ wrote:

07 18:28:01Until today we had a standard condensing boiler with a
coaxial flue.

Now we have a hole in our gable wall that I'd like to block up.
The problem is, the boiler was in the attic of a two story house
and even if I had a ladder that would reach, I wouldn't like to
work at that height.

This must be a fairly common issue. What's the easiest solution?
Some sort of plug that can be inserted from the inside?

Tim

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]

https://images.homedepot.ca/productimages/p_1000178920.jpg?product-images=l

GVH0030 4" duct cap, round, no crimp [the mating pipe has the crimp]

https://images.homedepot.ca/productimages/p_1000178919.jpg?product-images=l

When you install one (like, covering one leg of a Y on a
combustion exhaust), you use a couple self-tapping
steel screws on it.

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

--- SoupGate-Win32 v1.05
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tim+ <[email protected]> wrote:

07 18:28:01Until today we had a standard condensing boiler with a
coaxial flue.

Now we have a hole in our gable wall that I'd like to block up.
The problem is, the boiler was in the attic of a two story house
and even if I had a ladder that would reach, I wouldn't like to
work at that height.

This must be a fairly common issue. What's the easiest solution?
Some sort of plug that can be inserted from the inside?

Tim

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.

--- SoupGate-Win32 v1.05
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On 07/04/2025 23:46, Paul wrote:

On Mon, 4/7/2025 2:10 PM, tim+ wrote:

07 18:28:01Until today we had a standard condensing boiler with a
coaxial flue.

Now we have a hole in our gable wall that I'd like to block up.
The problem is, the boiler was in the attic of a two story house
and even if I had a ladder that would reach, I wouldn't like to
work at that height.

This must be a fairly common issue. What's the easiest solution?
Some sort of plug that can be inserted from the inside?


Tim

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]

https://images.homedepot.ca/productimages/p_1000178920.jpg?product-images=l

GVH0030 4" duct cap, round, no crimp [the mating pipe has the crimp]

https://images.homedepot.ca/productimages/p_1000178919.jpg?product-images=l

"Access denied" to *all* Home Depot websites (Fx, PM, and Vivaldi). Eg:
"You don't have permission to access "http://www.homedepot.com/" on this server.
Reference #18.7c421202.1744102446.bbc2440 https://errors.edgesuite.net/18.7c421202.1744102446.bbc2440"

--
Jeff

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

Tricky Dicky <[email protected]> wrote:

tim+ <[email protected]> wrote:

07 18:28:01Until today we had a standard condensing boiler with a
coaxial flue.

Now we have a hole in our gable wall that I'd like to block up.
The problem is, the boiler was in the attic of a two story house
and even if I had a ladder that would reach, I wouldn't like to
work at that height.

This must be a fairly common issue. What's the easiest solution?
Some sort of plug that can be inserted from the inside?

Tim

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?

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: https://raumluft24.de/en/the-advantages-of-monobloc-wall-air-conditioning/

The outside part is a plastic grille which folds in half, allowing you to
poke it through the hole and mount it externally from inside through the
hole. I imagine you could do something similar with a solid cover -
put silicone around the rim, fold in half, poke through the hole, unfold,
then pull it tight from inside the hole.

Here's a folding grille of that nature: https://www.amazon.co.uk/Ventilation-GABDF160R-Folding-Aluminum-Diameter/dp/B08KQF5P4F

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

Theo

--- SoupGate-Win32 v1.05
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Jeff Layman wrote:

"Access denied" to *all* Home Depot websites (Fx, PM, and Vivaldi). Eg:
"You don't have permission to access "http://www.homedepot.com/" on this server.

geo-blocked for GDPR reasons?

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On 08/04/2025 10:58, Andy Burns wrote:

Jeff Layman wrote:

"Access denied" to *all* Home Depot websites (Fx, PM, and Vivaldi). Eg:
"You don't have permission to access "http://www.homedepot.com/" on
this server.

geo-blocked for GDPR reasons?

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

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

Theo <[email protected]> wrote:

Tricky Dicky <[email protected]> wrote:

tim+ <[email protected]> wrote:

07 18:28:01Until today we had a standard condensing boiler with a
coaxial flue.

Now we have a hole in our gable wall that I'd like to block up.
The problem is, the boiler was in the attic of a two story house
and even if I had a ladder that would reach, I wouldn't like to
work at that height.

This must be a fairly common issue. What's the easiest solution?
Some sort of plug that can be inserted from the inside?


Tim

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?

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: https://raumluft24.de/en/the-advantages-of-monobloc-wall-air-conditioning/

The outside part is a plastic grille which folds in half, allowing you to poke it through the hole and mount it externally from inside through the hole. I imagine you could do something similar with a solid cover -
put silicone around the rim, fold in half, poke through the hole, unfold, then pull it tight from inside the hole.

Here's a folding grille of that nature: https://www.amazon.co.uk/Ventilation-GABDF160R-Folding-Aluminum-Diameter/dp/B08KQF5P4F

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

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

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

Tim


--
Please don't feed the trolls

--- SoupGate-Win32 v1.05
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Tim+ <[email protected]> wrote:

Theo <[email protected]> wrote:

Here's a folding grille of that nature: https://www.amazon.co.uk/Ventilation-GABDF160R-Folding-Aluminum-Diameter/dp/B08KQF5P4F

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

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

https://www.amazon.it/Ventilazione-GRADF125R-ventilazione-pieghevole-antinsetti/dp/B08KQFVGJQ
https://www.amazon.it/Coppia-griglie-pieghevoli-Olimpia-Splendid/dp/B01AM6RDOW https://www.amazon.it/Ventilazione-DFR140X-Plastica-Pieghevole-diametro/dp/B073V5DSFL

my search term being 'grilia pieghevole' in category 'Registri, griglie e sfiatatoi' (otherwise you get folding camping grills).

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

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On 08/04/2025 09:54, Jeff Layman wrote:

On 07/04/2025 23:46, Paul wrote:

On Mon, 4/7/2025 2:10 PM, tim+ wrote:

07 18:28:01Until today we had a standard condensing boiler with a
  coaxial flue.

Now we have a hole in our gable wall that I'd like to block up.
The problem is, the boiler was in the attic of a two story house
and even if I had a ladder that would reach, I wouldn't like to
work at that height.

This must be a fairly common issue. What's the easiest solution?
Some sort of plug that can be inserted from the inside?


Tim

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] >>
    https://images.homedepot.ca/productimages/p_1000178920.jpg?
product-images=l

GVH0030 4" duct cap, round, no crimp     [the mating pipe has the crimp] >>
    https://images.homedepot.ca/productimages/p_1000178919.jpg?
product-images=l

"Access denied" to *all* Home Depot websites (Fx, PM, and Vivaldi). Eg:
"You don't have permission to access "http://www.homedepot.com/" on this server.
Reference #18.7c421202.1744102446.bbc2440 https://errors.edgesuite.net/18.7c421202.1744102446.bbc2440"

Access is possible using Tor Browser.

Copied here for convenience:
https://ibb.co/zHZ7bTwk
https://ibb.co/B2dYm27w

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

Theo <[email protected]> wrote:

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: https://raumluft24.de/en/the-advantages-of-monobloc-wall-air-conditioning/

The outside part is a plastic grille which folds in half, allowing you to poke it through the hole and mount it externally from inside through the hole. I imagine you could do something similar with a solid cover -
put silicone around the rim, fold in half, poke through the hole, unfold, then pull it tight from inside the hole.

Here's a folding grille of that nature: https://www.amazon.co.uk/Ventilation-GABDF160R-Folding-Aluminum-Diameter/dp/B08KQF5P4F

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

Theo

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

--
Please don't feed the trolls

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