Identification of causes of range hood fires

Currently, range hoods have become an indispensable appliance in the kitchen, but people often ignore the fire safety hazards they present during use. When the range hood is working, the motor will release a lot of heat. After long-term use, too much oil on the motor prevents heat dissipation, which may cause the motor to overheat and cause a short circuit. In severe cases, the oil attached to the surface of the motor may be heated and burn, causing a fire.
In addition, most people only clean the surface of the range hood when doing kitchen hygiene. If the inside of the range hood is not cleaned for a long time, it will cause the oil pipe to be clogged or oil leakage will occur at the edges. The flame will jump up when cooking. In addition, the indoor temperature is high in summer, and the accumulated oil smoke will easily burn.
In the case of identifying the cause of a range hood fire, it is an indispensable link to conduct quality appraisal of the range hood itself and investigate the internal causes of the fire. Zhongke Testing provides quality identification services for the causes of range hood fires.

range hoods can be classified according to discharge mode, switch form, appearance features, and installation methods.
1. According to the discharge mode, it can be divided into: external discharge type, circulation type and dual-use type.
2. According to the switch form, it can be divided into: mechanical type and electronic type.
3 can be divided into: thin type, deep type, tower type, side suction type, and others.
4, can be divided into: wall-mounted, island, embedded, split

GB/T 17713-2011 Range hood
GB/T 17713-2022 Range hood and other cooking smoke suction and exhaust devices
GB 29539-2013 Range hood energy efficiency limit value and energy efficiency grade
GB 4706.28-2008 Safety of household and similar electrical appliances Special requirements for range hoods
GB/T 22939.2-2008 Packaging of household and similar electrical appliances Special requirements for range hoods
GB/T 4214.13-2021 Noise test methods for household and similar electrical appliances Special requirements for range hoods and other cooking smoke suction and exhaust devices

was entrusted by a court to analyze the causes of the range hood fire accident involved. The expert team conducted an on-site inspection to investigate the post-accident status of the range hood involved, and simulated and calculated the cause of the accident. The quality appraisal opinion obtained was:
1. The "range hood" involved in the case complies with GB/T 17713-2011 "Range Hood" and GB 4706.28-2008 "Safety of Household and Similar Electrical Appliances"
2. After ruling out the internal causes of spontaneous combustion of the "range hood", it was initially determined that the cook opened the stove throttle too wide when cooking, causing the flames ignited on the stove to go straight into the exhaust pipe above the stove, causing the oil dirt in the pipe that had not been cleaned for many years and causing the fire.
The "range hood" involved in the case is susceptible to being contaminated by oil fume and if left uncleaned for a long time, oil stains will adhere and form on the surface of the range hood. This is also one of the reasons why the fire spread after a fire broke out and caused the "range hood" involved in the case to catch fire and explode.