CAST IRON SLIDING VENT. PLEASE SELECT THE REQUIRED DESIGN FROM THE ABOVE DROP DOWN SELECTION BAR. FINISH:ANTIQUE IRON -CAN BE PAINTED OR LACQUERED TO YOUR CHOICE. IF LEFT IN ORIGINAL CASTING FINISH IT WILL EVENTUALLY RUST. 9 X 3″ SLIDING VENT BRICK, 235mm x 80mm/9 3/16″ x 3 1/8″ 9 X 6″ SLIDING VENT BRICK, 235 x 158mm/ 9 3/16″ x 6 3/16″. 9 X 9 SLIDING VENT BRICK 228 X 228mm/. 9″ x 9″ x 2. 9 X 3 ORNATE.