150mm ( 6″ ) Wall Ring
Used to make good where a flue pipe goes through a non-combustible wall.
Matt Black / Gloss Black
You should not install any piece of Vitreous with-in 3 x the internal diameter from combustible material eg: plaster board ceilings/wood etc, a 6″ diameter piece of Vitreous should be 18″ away from combustible materials , each joint made should be sealed with Fire cement. Vitreous Flue pipe is only to be used as a connecting piece of flue between the appliance (EG: woodstove) and the flue liner or chimney stack.