Filling old flue hole

[TeaAndBiscuits]

Hi all,

I’ve had my boiler replaced recently and moved to a different room. I’m now left with a large hole where the flue used to be. I've duct taped over the hole on the inside temporarily just to stop draughts.

Looks like it was made with a bolster chisel and it’s significantly larger than the flue was and irregular in shape.

What would be the best process/materials to fill this in with?

Ordinarily I’d think it best to just knock the hole to the nearest whole bricks, then refill with new bricks, however this wall isn’t made of normal bricks, it’s these odd irregular stone effect bricks (Photo from a different part of the house - not sure what they’re called?) and rendered/pebbledashed over the top. No, I have no idea why someone would do that.

 

[footprints]

A few bits of broken brick with a standard mortar mix then try and match the pebbledash (good luck with that) I would feel inclined to fix a dummy plastic vent over the repair to disguise it. A bit of insulation between and brick up and plaster the inside.
Something like this or whatever fits.
https://www.ebay.co.uk/itm/4-in-Dry...Outlet-Duct-4-Inches-Hood-White-/142886837882

 

[Leofric]

I would feel inclined to fix a dummy plastic vent over the repair to disguise it.

- or a functioning vent