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What are the common HEPA exhaust unit failures and solutions?
What are the common HEPA exhaust unit failures and solutions?Efficient exhaust units play a vital role in maintaining indoor air quality and ventilation. However, just like any device, it can be subject to some glitches. Here are some common faults and their solutions.First, insufficient air volume Fault manifestation I feel that the indoor ventilation effect is significantly worse, and the odor and smoke that can be quickly discharged can stay in the air for a longer time. In some places that need to strictly pass the risk control system, such as laboratories, kitchens, etc., this is more obvious. For example, when cooking in the kitchen, the oil smoke can not be discharged in time, resulting in the entire kitchen being filled with smoke. Possible causes and solutions Filter blockage: Reason: With the increase in use time, dust, hair, oil, and other impurities will gradually accumulate on the filter screen, blocking the pores of the filter screen, and thus limiting the circulation of air. This is one of the most common causes of insufficient air volume. Solution: Turn off the exhaust unit power supply, open the filter bin of the equipment, and take out the filter screen. If it is the first effect filter, you can use a soft brush to gently brush the dust on the surface, and then use a vacuum cleaner to clean the dirt on the back; For high-efficiency filters, you can use low-temperature compressed air to blow from the back of the filter, or gently rinse it in warm water (be careful not to rub and sun, to avoid dust when drying). After cleaning or replacing the filter, reinstall and turn on the device to check whether the air volume returns to normal. Fan failure: Cause: The motor of the fan is damaged, the impeller is loose or deformed, etc., which may cause the fan speed to decrease, and then the air volume to decrease. For example, an electric machine running for a long time may be damaged by overheating, or the impeller may be deformed by external impact. Solution: First check whether the power connection of the fan is normal and whether there is a loose or short circuit. If the power supply is normal, open the fan shell (in the case of safety, such as cutting off the power first) and check whether the impeller is loose or deformed. If there is a problem with the impeller, try to re-fix or replace the impeller; If the motor is faulty, it is recommended to contact a professional maintenance personnel to repair or replace the motor. Pipe blockage or leakage: Reason: The inside of the ventilation pipe may be blocked or leaked due to dust accumulation, foreign matter entry, or aging of the pipe rupture. For example, during the renovation process, there may be construction waste entering the pipe, or the pipe joints are not tightly sealed, resulting in leaks. Solution: For the blockage situation, you can try to use professional pipe cleaning tools, such as a pipe dredging machine, to clean the blockage in the pipe. If it is a pipe leak, it is necessary to find the leak point, apply sealant, or replace the damaged pipe section to repair the leak. 2. Excessive noise Fault manifestation The exhaust unit generates abnormal and annoying noises during operation, which may be continuous buzzing, harsh friction, or irregular vibration. This noise will affect the quiet indoor environment, especially in bedrooms, libraries, meeting rooms, and other noise-sensitive places. Possible causes and solutions Loose or worn fan parts: Reason: The impeller, bearing, and other parts of the fan may be loose or worn after a long time of operation. For example, the loose screws on the impeller will cause the impeller to be unbalanced when rotating, resulting in vibration and noise; Bearing wear will make the fan rotation not smooth, producing friction sound. Solution: Turn off the power supply of the equipment, open the fan shell, and check the impeller and bearings. If the impeller screws are found to be loose, use tools to tighten them; If the bearing is seriously worn, a new bearing needs to be replaced. When installing a new bearing, make sure it is installed correctly and add the right amount of grease to reduce friction. Foreign matter into the air engine room: Cause: During the operation of the equipment, there may be small foreign objects, such as paper, plastic debris, etc. entering the air engine room through the air inlet and colliding with the fan components to produce noise. Solution: Turn off the equipment, open the fan door, carefully check and remove foreign objects. At the same time, you can consider installing a protective net in the air intake to prevent foreign bodies from entering again. Resonance phenomenon: Cause: The exhaust unit is improperly installed or some components of the device resonate with the surrounding environment. For example, if the equipment is installed on a weak support, or the speed of the fan is close to the natural frequency of the equipment housing, it may cause resonance and amplify noise. Solution: Check that the installation of the equipment is solid, if necessary, you can reinstall the equipment, using shock pads or brackets to reduce vibration transmission. If it is a resonance problem, you can try to adjust the speed of the fan (if the equipment allows), or paste damping materials on the equipment housing, such as rubber pads, sound-absorbing cotton, etc., to change the natural frequency of the equipment and eliminate the resonance. Third, the odor is distributed. Fault manifestation The air discharged from the exhaust unit has an unpleasant odor, such as a musty, sour, or burnt taste. This situation not only affects the indoor air quality but also may cause harm to human health. Possible causes and solutions Filter odor: Reason: The filter adsorbed a lot of dust, oil, microorganisms, and other impurities, if not cleaned for a long time, these substances may breed bacteria, mold, and odor. Solution: According to the above filter cleaning method, clean or replace the filter in time. For the filter that has produced odor, it can be soaked with a small amount of disinfectant after cleaning (be careful to rinse thoroughly to avoid disinfectant residue), and then dry and reinstall. Internal water or mold: Cause: In some environments with high humidity, or due to poor drainage of the equipment, water may be accumulated inside the equipment, which will breed mold and produce odor. For example, in the exhaust unit of the bathroom, if the drainage pipe is blocked, it is easy to have internal water. Solution: Turn off the power supply of the device, open the shell of the device, and check whether there is water inside. If there is water, it is necessary to clean up the water first, and then find out the cause of the water, such as the drainage pipe blockage, it is necessary to dredge the drainage pipe. For the parts that have become moldy, you can clean them with special mildew remover, and then keep the inside of the equipment ventilated and dry. Motor overheat burning: Reason: Overload operation for a long time or poor heat dissipation may cause the motor to overheat and produce a burnt smell. For example, the impeller of the fan is subjected to excessive resistance, or the motor vent is blocked, which will increase the temperature of the motor. Solution: Turn off the equipment immediately, check the heat dissipation of the motor, and clean up the dust and debris around the motor vent. If the motor has shown signs of burning, it is recommended to contact professional maintenance personnel for inspection and repair, who may need to replace the motor or related electrical parts. |
