Standing Desk Frame, High quality, primum Suzhou Herstar Medical Technology Co., Ltd. , https://www.hosunherstar.com
When the inclined fan is activated, the large air intake aligns with the hot oil flue gas column, allowing cold ambient air to mix with the hot oil vapor and soot. The oil and gas do not adhere to the inner walls in the presence of hot air and emulsion fog. According to experimental findings, after six months of operation, only a small amount of saturated fatty acid oil (less than 50 grams) may accumulate on the inner walls of the sealed main air chamber.
Quality inspection for range hoods primarily focuses on air volume as the key test indicator. According to industry standards, the hood is installed horizontally, and the duct is aligned with the test screen to measure the working air volume. A qualified air volume is typically rated at 6 m³/min. However, this testing condition does not reflect real-world usage, as it only measures the removal of air and water vapor, failing to accurately represent the overall performance of the range hood. The actual air volume depends on factors such as the size of the fan inlet and outlet, the overall design, and not solely on leakage or exhaust displacement.
An ideal range hood inspection method should be conducted under controlled conditions: specified suspension height, indoor environment, heating settings, and duration. The difference between the amount of heated oil and the oil extracted represents the absolute leakage. Two recommended detection methods are:
1. Measuring airflow at a height of 1.4–1.5 meters, checking wind direction across several points (one-way cross-sectional flow), and sampling 5–10 locations. This helps create a detailed airflow and direction diagram, setting a qualified direction value and rated air volume.
2. Applying a detectable gas (such as ethylene or sulfur hexafluoride) to the cooking surface and then operating the range hood to measure the residual concentration of the gas in the specified indoor conditions, pumping time, and sampling location. For airflow and direction measurements, a precision digital anemometer with 0.1 m/s accuracy can be used. Gas leakage can be detected using a gas chromatograph, ensuring accurate and reliable results.