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How to fill redundant vent hole

5 replies

brokenbiscuitsadness · 09/01/2026 13:57

I’ve just discovered one of the causes of the freezing draught in my Victorian lean to kitchen!
its an old extractor hole that which I can literally see daylight through.

is there an easy way for me to fill it with needing DIY prowess or power
tools? I’m in my own and trying to learn basic house maintenance

How to fill redundant vent hole
OP posts:
ACynicalDad · 09/01/2026 14:17

Simplest, short-term fix, on Amazon search Wall Hole Cover Protective Vents Decor Plastic Cap, Air Conditioning Wall Hole Decoration, Ventilation Round Cap Wall Hole Cover Protective, 40-100Mm(100mm)
Slightly more permanent but not the most beautiful quick fix is that you can get expanding foam, cut it back a bit and polyfill on the inside, but it will fill all gaps and may fill an internal cavity wall. Also, I presume you need to sort it on the other side too? You really don't want foam showing. I'd cut out part bricks, buy a tub or ready mixed mortar and match the bricks as best you can.

brokenbiscuitsadness · 09/01/2026 14:20

@ACynicalDadthank you! Certainly would give the expanding foam/polyfilla a go. Cutting bricks might be a
bit beyond me though!

OP posts:
ACynicalDad · 09/01/2026 14:28

No - I'd knock out any cut bricks and put in fresh ones so no cutting, but you can also just cut back an couple of cm of foam then buy a tub of mortar and fill the outside of it in a similar way to how you use pollyfilla inside.

Just make sure expanding foam isn't filling a cavity wall up.

highlandharpy · 09/01/2026 14:35

I don't have advice for a wall vent but will share my own story in a similar-ish vein:

I had a cupboard in my last house that had an old incinerator in it. Very odd to me, but apparently used to be very common; women used them dispose of sanitary products.

It was a waste of a good space, so in my naivety, I ripped out the old unit and pipe and transformed it into a pretty alcove with mirrors and a flower arrangement. It was lovely...for about 10 days... until it rained 😅

I scooshed a tonne of expanding foam in the pipe cavity as a short term fix. A few months later, when I had funds, a roofer came and stuck something over the hole in the roof where the pipe had come from (cost about 60 quid from what I can remember).

Lesson: don't rip out pipes and replace them with flowers 😁

Hoplittlesbunnieshophophop · 09/01/2026 16:04

We had similar when we moved our vented tumble dryer - expanding foam, cut foam off flush to wall, fill, sand and paint. Job done!

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