Cooking and food industry units that discharge lampblack must install lampblack purification facilities and ensure that they operate as required during operation. The unorganized emission of lampblack is regarded as exceeding the standard. The length of the outlet section of the exhaust pipe should be at least 4.5 times the diameter (or equivalent diameter) of the straight pipe section. The outlet of the exhaust pipe should be far away from vulnerable buildings. The specific provisions on the height and location of smoke exhaust pipes shall be formulated by the Provincial Environmental Protection Department. People's Republic of China (PRC) Law on the Prevention and Control of Air Pollution Article 49 Combustible gases produced by industrial production, landfill or other activities shall be recycled. Do not have the conditions for recycling, pollution prevention and control should be carried out. If the combustible gas recovery and utilization device cannot operate normally, it shall be repaired or updated in time. If it is really necessary to discharge combustible gas during the period when the recovery device cannot operate normally, the discharged combustible gas shall be fully burned or other measures to control the emission of atmospheric pollutants shall be taken, and the report shall be made to the local competent department of ecological environment, and it shall be repaired or updated within a time limit as required.

Legal objectivity:

People's Republic of China (PRC) Law on the Prevention and Control of Air Pollution Article 49 Combustible gases produced by industrial production, landfill or other activities shall be recycled. Do not have the conditions for recycling, pollution prevention and control should be carried out. If the combustible gas recovery and utilization device cannot operate normally, it shall be repaired or updated in time. If it is really necessary to discharge combustible gas during the period when the recovery device cannot operate normally, the discharged combustible gas shall be fully burned or other measures to control the emission of atmospheric pollutants shall be taken, and the report shall be made to the local competent department of ecological environment, and it shall be repaired or updated within a time limit as required.