Question: I am hoping someone can give me an explanation on what function and how to use the air control on the back of a Dutchwest federal airtight that was manufactured in Taiwan. I thinks it controls itself automatically after you set and get a fire going. Thanks for your help. Answer: It's a piece of metal that's coiled. As it heats up the coil expands. The coil "moves" and thereby controls amount of air that's being allowed into the stove. Too much air and the wood burns too fast, not enough, and the fire goes out.