The Cast Iron Air Brick Company have been champions of UK made products for years. Our products are made in foundries of all shapes and sizes across the country from Somerset to Scotland. Many of these foundries have been producing iron castings since the 19th century, but our newest foundry is, by far, the most interesting. Situated in a tiny unit on an industrial estate, the little “micro foundry” supplies us with the 4″ and 5″ cowled cast iron Conservation vents. Our photograph (attached) features the entire workforce (yes both of them) turning out a crucible of molten iron to cast four of our Conservation vents.