We have a Janus 3/30 water boiler which is currently flues through an asbestos flue jointly with our warm air boiler. There is damage at the ridge terminal and so we are considering its complete removal of said flue. Ignoring the warm air boiler as plan to replace. The janus document says the flue should be 75mm (3in) as standard, with adapter plate to convert to 100mm (4in) flue.
1. Does this mean a 5in twin walled flue as I have not seen 4in
2. Does flue work have to be done by Gassafe, or Hetas or can any competent builder do the work?
Thanks
1. Does this mean a 5in twin walled flue as I have not seen 4in
2. Does flue work have to be done by Gassafe, or Hetas or can any competent builder do the work?
Thanks