Highly compact iron smelting setup. If you want to tidy up the aesthetics, small concrete pillars can be added below the floating mergers, without clipping any belts, to give them some "support".

120/m ore input 120/m ingot output

Easy to setup. 1.) connect Mk2. belt to primary splitter. 2.) connect power to primary power pole. 3.) connect Mk2. output to storage/production line.