N
namsag
Agile your thought process behind this is completely wrong as in don`t fit because what may happen in the future by someone else... If you worked like that you would never service or repair an open flued appliance in case someone blocked off the vent etc etc .
We would even have to allow for the possibility of a wasp nest being built and appliances being attacked by copper formate and falling apart.
We would even have to allow for the possibility of a wasp nest being built and appliances being attacked by copper formate and falling apart.