Just had oil boiler serviced and was told balanced flue failing on old Tranco Eurostar.Starting to suck exhaust fumes into boiler instead of clean air.Was told that as a temp. measure until I get a replacement delivered it's possible to unclip air hose and draw air from there and can block exhaust fumes coming into room with a rag.Boiler in draughty porch with open windows.Would welcome any opinions on this
Thanks
Thanks