I’d like to install a wood stove in my new extension, so no existing chimney or fireplace. I guess this means “flu” installation. I hate those unsightly double walled flues which look completely disproportional to the width of stoves. I never saw them anywhere else but the UK. So first question - does anyone know if I have to have those double walled ugly pipes? Second question - has anyone paid for this type of installation lately & how much did it cost?