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No, these boilers don’t need ventilation for cooling and take their combustion air from outside via the flue.
Thank you

And have a picture from the outside now. Definitely not filled in
 

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Thank you

And have a picture from the outside now. Definitely not filled in
Is the installer gas safe registered? I would be contacting gas safe in that instance anyway, especially as he has no intention of fixing a trivial issues.
 
Its just a personal thing but i would not have had all those pipes going vertically downward like that. I'd have gathered them together neatly to one side for a better appearance and also to provide the opportunity for them to be boxed in.
 

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