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Advantages of ventilation ducts

1. Reduce leakage. The installation of the spiral duct significantly reduces the connection points between the pipes and reduces the leakage at the joint of the pipe fittings to a minimum. The length of the typical spiral duct is 3~6m, while the length of the typical rectangular duct Only 1~1.5m. 2. Standardized products. The production of fittings (pipe fittings and joints) for spiral air ducts is highly automated, systematic, and has industrialized quality control. 2. Low installation cost. The installation time of a circular duct system is only 1/3 of that of a similar rectangular duct. 3. Only a small installation space is required. Without adding any pressure drop, a 200mm diameter circular pipe can replace a 250×150mm rectangular pipe in the same installation space.

How to clean the exhaust duct

If the exhaust pipe is not cleaned for a long time, it will accumulate a lot of dirt and cause adverse consequences. So how to clean it? Luhai HVAC will answer for you.   1. The installation and cleaning personnel first remove the upper and lower sections of the pipeline, that is, the airborne method. This method is mainly used to clean the vertical flue of more than 50 cm. Fix the high safety rope above the flue, fasten the seat belt, install cleaning personnel, and clean the oil stains from the vertical flue from top to bottom. This method has great danger, strong technicality, strong applicability and good cleaning effect. Since the vertical flue generally has less oil accumulation, it can be cleaned once a year. 2. The manual entry method is adopted, which is labor-intensive. For parallel flues larger than 40 cm square, it can be manually drilled in and cleaned. Note to strengthen ventilation, equipped with low-voltage (36V) lighting power supply.   3. This method is used when the manual cannot enter, that is, the dismantling method, when the Jinan exhaust pipe is less than 40 cm. Set up cleaning personnel to disassemble a section of the flue at certain intervals according to the actual situation of the site, and extend it to both sides for cleaning. This method has good effect, great difficulty and high cost. 4. The installation and cleaning personnel use special non-spark drilling tools to open holes on one side or multiple sides of the pipeline. This method is used for the flue that cannot be manually entered and is difficult to disassemble. The installation and cleaning personnel can Take this approach. The amount of openings, the interval and the number of openings depend on the site conditions. After cleaning, the pipeline seal will be restored.   5. The flue with a short cleaning cycle is cleaned by this method, that is, the machine cleaning method, which has less oil pollution. First, spray the cleaning agent into the pipeline to soften the oil, and then use a 30-meter-long electric flexible shaft brush to clean the oil. This method uses a 30-square-centimeter vertical flue, a small concealed flue that cannot be manually accessed and is inconvenient to disassemble. This type is not easy to clean and easy to accumulate oil, so the cleaning cycle should be shortened.   The above is the method of cleaning the exhaust pipe, I hope it can be helpful to everyone. If you have needs in this regard, please contact our company.

Can a common plate flange be used for the exhaust duct

The common plate flange galvanized air duct can be used on the exhaust pipe. The use range of common plate flanges is low and medium pressure systems, and the long side of the air duct is less than or equal to 2000mm, as long as the long side of the exhaust duct is less than or equal to 2000, and the pressure is within 1500Pa (medium and high pressure dividing point), it can be used. . The air duct of the smoke prevention and exhaust system needs to be made of non-combustible materials. It is designed according to the high-pressure system, the surface is insulated, and the air leakage is less than 0.0117. In the current national standard, there is no mandatory requirement that common plate flanges cannot be used in smoke exhaust pipes. It only specifies the scope of use of thin steel plate flanges (ie common plate flanges) ducts: Applicable pressure level: medium pressure (500Pa)