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It's barely covered by the plaster. Any fitting will poke out
Is the duct ventilated both ends?
Can you access the compression joints both ends?
Any other appliances?
Did the installer know what...
Sounds like hassle.
Would be handy for some boiler installs though
Be carefull commissioning some one else's work
See if your water supplier will replace your lead main
Kane with fixed costs for 5 years
Light everything and check you are not getting more than xmb drop between meter an each appliance
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