The trademarks (nominal) of unqualified range hoods include: Jin Huasong, Crown, SAMPO Xinbao, Panda, BSB Baishibao, Yongduodian, OPAICN, Patek King, Yasili, Shanghai. Shengbao Kitchen & Bathroom, Crown Tangshen, Shangbao Electric Appliance, Qiaotai, KRRWON, Dual, Aideed and other brands.

the unqualified items mainly include: protection against touching live parts, input power and current, leakage current and electrical strength, abnormal operation (excluding the test in clause 19.11.4), structure, internal wiring, power supply connection and external cord, grounding measures, electrical gap, creepage distance and solid insulation, and noise.

The results of this spot check show that the unqualified items are seven indicators: power connection and external cord, grounding measures, screws and connections, noise, air volume, wind pressure and total pressure efficiency.

1. power connection and external cord. According to the national standard, the power cord specifications of range hoods with a mass greater than 3kg should not be lighter than line 6227IEC53(RVV). This spot check found that the power connection and external cord items of two batches of products were unqualified.

2. Grounding measures. Range hood products should have grounding measures and grounding anti-loosening measures, and the resistance between grounding terminal and grounding metal is low. This spot check found that the grounding measures of three batches of products were unqualified.

3. screws and connections. According to the national standard, the structure of electrical connection should not use easily deformable insulating materials to transmit contact pressure. This spot check found that two batches of screws and connection items were unqualified.

4. Noise. This spot check found that the noise items of five batches of products were unqualified, and the noise generated by the range hood exceeded the standard limit and the enterprise's express value when it was in the top-grade operation.

5, air volume. This spot check found that the air volume of 5 batches of products was unqualified, and the measured air volume value was lower than the standard value or the enterprise express value.

6. Wind pressure. The wind pressure index directly reflects the pressure generated under the specified air volume, which is to assess the ability of the range hood to resist backward wind. The smoke exhaust pipe is long or the flue needs greater wind pressure to discharge the smoke. The greater the wind pressure, the stronger the ability of the range hood to resist backward wind. This spot check found that the wind pressure items of 7 batches of products were unqualified, and the measured wind pressure value was lower than the standard value or the enterprise express value.

7. Total pressure efficiency. Total pressure efficiency reflects the ability of range hood to effectively use motor power. This spot check found that 1 batches of products failed in the total pressure efficiency project.