Removing old cast iron fireplace, how to vent chimney into room

leck · 26-03-2019 07:00PM #1

I'm having an old cast-iron fireplace removed in a bedroom this week. Separately I'm having someone cap the chimney. The man doing the capping said it's important to have the disused fireplace vented into the bedroom otherwise there will be problems with the chimney sweating.

What kind of vent do I need to place in the wall? I imagine I'd be looking for a sort of rectangular metal grille with a lever so you can open/close the vents. Where would I get one of these?

CJhaughey · 27-03-2019 09:30AM

Surely the man doing the capping should be competent enough to do the venting as well?

leck · 27-03-2019 10:58AM

The man doing the capping will ensure the cap is vented. That job is being done later. I need to find a replacement for a broken chimney pot before he puts up scaffolding and goes on the roof, so both chimney pots can be dealt with at the same time.

Today the fireplace is being taken out. It's the ventilation of that area I'm asking about. This is the fireplace being removed. Hole in wall to be covered over with plasterboard and then skimmed.

M.T.D · 27-03-2019 03:45PM

Ideally the chimney should be ventilated at the top and bottom. The small plastic rectangular or round vents in the plaster board with a tube through the insulation would be sufficient. The vents are not large and the capped chimney acts as a baffle so should be permanently open types. If the chimney is on an outside wall and you have a problem with the vent in the bedroom, you could put the vent on the outside.

leck · 27-03-2019 05:18PM

M.T.D wrote: »

Ideally the chimney should be ventilated at the top and bottom. The small plastic rectangular or round vents in the plaster board with a tube through the insulation would be sufficient. The vents are not large and the capped chimney acts as a baffle so should be permanently open types. If the chimney is on an outside wall and you have a problem with the vent in the bedroom, you could put the vent on the outside.

What size vent would be best put in the plasterboard? I'm guessing the smaller the better.

The fireplace is boarded up now. They filled a bag with nest bits and pieces that fell down the chimney. Just regretting now that I didn't get the chimney cleaned to dislodge any other material that might be up there before they closed off the fireplace.

Removing old cast iron fireplace, how to vent chimney into room

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