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Chimney venting requirements after fireplace removal

M

Moneypit42

Joined
2 Nov 2011
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Location
Kent
Country
United Kingdom
I’m removing a fireplace & understand the chimney should be vented by a grille. I’ve also heard of chimney balloons to stop draughts.
Is the venting mandatory? Would the house structure be compromised by fitting a balloon and blocking the flue?
Many thanks.
 
Either block it completely or vent it totally. In between those two poles you get condensation.
 

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