The {0} has the option to filter what products can be dumped within its managed area. This managed area ignores the global dumping filter which is ideal for restricting what materials can be dumped. For example, you can only allow {1} to be dumped in a specific area by removing it from the global dumping filter and adding it to dumpable products in the {0} window.
With {0} being smelted, the {2} will produce <b>{1}</b>. {1} can be dumped anywhere on the island by placing dumping designations (unless you prevent {1} dumping by changing the <b>global dumping filter</b>). Trucks will always prioritize delivering {1} and other materials to where it is needed before dumping it (e.g. concrete production). Dumping {1} is important as typically your smelting industry will produce way more {1} than you can use. Dumping it has no pollution effect.
Watch the furnace recipe in progress whilst trucks automatically supply it with {0} and coal. Iron slabs produced in a {1} will be stored there until trucks can find a place for them to be delivered. Later, you will be able to unlock and build conveyor belts to deliver iron directly to your production buildings or storage.