Removed gas fire - what to do with flue?

[k13wjd]

Morning folks,

I'm just about to remove a Flavel gas fire - had a gas safe engineer come out last week and disconnect/cap the gas supply, so it's now isolated.

The flue basically comes out the back of the fire and goes straight up 3.5m through the roof, rain guard etc fitted.

My initial plan was to leave the top end as it is allowing it to vent, and to seal the fireplace end of the flue with a suitable plug and sealant - allowing any condensation to evaporate.

Does that sound ok, or should I consider sealing the top and venting the bottom?

Any opinions welcome!

 

[cross thread]

Open at the top and small vent at the bottom to keep airflow through the flue

 

[dilalio]

If the chimney is built on to the house, you can vent it at the base outside rather than inside.

 

[k13wjd]

So it's not a chimney as such, it's a 5(ish) inch galv steel pipe, boxed inside plasterboard etc.

Thinking more about it, there is an air brick under the floor level right under the flue outside.

Once I remove the fire and hearth, I'll maybe look and see if I can vent it via that air brick, it can only be 8 inches or so away. Be an easy enough solution I guess!