Abstract: A refractory brick assembly unit is provided, including a refractory brick member having an inner passageway extending therethrough from a first opening at an inlet end face to an opposed second opening at an outlet end face thereof. A vector tile is also included, having an annular portion that is coaxially arranged with respect to a longitudinal extension axis of the inner passageway of the refractory brick member positioned in a portion of the inner passageway of the refractory brick member and located proximate the second opening at the outlet end face thereof, and having a domed portion extending from a first surface of the annular portion at a predetermined angle with respect to the longitudinal extension axis of the inner passageway of the refractory brick member so as to occlude at least a portion of the second opening of the refractory brick member at the outlet end face thereof.