Blast Furnace

Makes steel from iron (ingot, raw, ore, crushed, purified or dust) and 6000 mB of compressed air (6 cells). Uses no EU: it needs heat through its back face (the orange square) from an adjacent heat generator. Accepts up to 20 hU/t; it first heats up to 50,000 hU (about 2 minutes), then takes 5 minutes per ingot using 1 hU/t. Also gives slag. It only heats up with iron inside and cools down without heat.