IronBeefa

This is the specification for said heater

Purchased this burner from eBay ( I know not the best) but will hopefully serve the purpose for the mancave, it has come with a non insulated flue and I need to put the flue through an insulated roof and wood therefore I need to get an insulated flue that will fit. dos anyone know what would be the best flue to get and what I can use to convert the size of this one into the insulated one? and if anyone could send me a link that would be much appreciated Thank you!!