Fireworks chimney length

Generally, if the horizontal direction is less than one meter, it will be four meters high. It is too high and waste. After all, a good stainless steel pipe has two to three hundred yuan and one meter, and if the smoke pipe is too high, the heat loss will be more. Compare Fei Chai. Of course, if it is too short, there will be insufficient smoke, and there may be smoke in the room