Venting through floor for bricked up fireplace

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I'm bricking up an old fireplace and was wondering if getting a core drill and going down through the old hearth into the floorspace underneath would be ok as venting for the chimney stack (to avoid venting into the room)?
 
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The hearth will go down to earth or site concrete or whatever.....are you thinking of drilling horizontally to meet the vertical hole?
John :)
 
There is about 5 foot under the floor but the 1st floor hearths are concrete on slate so I just assumed the ground floor would be the same. Maybe the underfloor part of the stack is back filled, I'm not sure. I was going to replace a brick with an air brick under the floor but I guess if it is solid that wouldn't work.
Thanks, I didn't think about that. Will do some investigating.
 
For various reasons your proposal to drill down is a definite non-starter.

Use a conventional vent in the face of the c/breast - or, if the fireback wall is an external wall, you could fit an air brick in the outside brickwork.
 
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Yes thanks vinn. Was just trying to avoid a draughty vent when it's windy but doesn't look like I have a choice (can't go through external wall as the exterior is hidden behind a porch wall).
 
Heat rises so the air flow is up the flue rarely down it.
To cater for downdraft fit a Colt terminal on the chimney pot.
 
I just typed that without thinking - really I mean without it sucking out all the heating. Will put a vent cap on the pot but even so we are in a very exposed coastal location and when the wind gets up you can really feel the chimney's sucking all the heating out on other chimneys that have been done the same way.
 
You can fix a 10 x 6 Hit&Miss vent as a c/breast vent, this will allow you to open and close as needed.
Or google chimney terminals such as Colt Mfr's. or the various wood burner appliance sites.
Or pay a HETAS to visit.

edit: is either of the side cheeks of the c/breast available for installing a vent?
 
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Purely for interest, if it was possible to vent the flue through the hearth in this way what issues would there be?
John :)
 
Thanks vinn, I think the hit&miss vent sounds like the best plan in that case.

Burnerman, I looked into how to physically do it and I think a 90 degree pipe would be possible (down then through the front of the stack under floor level. Bit of a faff to do it but not too bad. I have plenty of vents under the floor so would also be interested to hear if doing this would introduce other problems.
 
The reason I'm curious.....
I've come across two oil fired Rayburn cookers which had their combustion draught taken, by stainless ducts, through the hearths - both had two ducts, maybe 4" diameter but not sure there. Naturally enough, the ducts were set and the concrete poured around.
One had the air ducts open under the floor :eek: The other ducted to the outside.
One things for sure, I wouldn't be lifting the things out to change anything :LOL:
John :)
 
wilco - whatever you do don't do what vinn says :ROFLMAO:
 
@Burnerman and @tireetim

Did you ever end up venting through the hearth in to the floorspace?

I am thinking of doing the same thing.

the vent would not go from the hearth into the floorspace (downwards)

it would go from the floorspace, or duct from outdoors, to the hearth or up the chimney (upwards)

Occasionally, fresh air supply to fireplaces is provided by vents in front of the hearth, to prevent draughts in the room. This is rarely seen in working homes, but you will see brass or iron grilles in some stately homes.
 

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