Geez man – think you better get a qualified gasfitter to undertake that power flue of yours – from your description I reckon it will never work.
I ain’t about to give anyone instructions on how to install a power vented flue for health and safety reasons.
Don’t muck about with gas appliances get a qualified gasfitter to do the work – that way you can rest easy knowing it is done properly and safely.
Selgas Services Ltd
Craftsman Gasfitters, Plumbers, Electrical Service Technicians