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<\/figure>\n\n\n\n1. The "culprit" causing the air duct system to smell bad.<\/h2>\n\n\n\n
Before attempting to address the issue, building owners and operators need to clearly identify the cause of the odor:<\/p>\n\n\n\n
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- Accumulation of fine dust and moisture:<\/strong>\u00a0Dirt from the external environment passes through the filter, combining with moisture inside the pipe to form a layer of sludge \u2013 an ideal environment for bacteria to thrive.<\/li>\n\n\n\n
- Mold growth:<\/strong>\u00a0Central air conditioning systems can easily accumulate condensation when they stop working suddenly. The temperature difference creates conditions for mold to grow, producing a characteristic musty smell.<\/li>\n\n\n\n
- Decomposing organic matter:<\/strong>\u00a0Insects, rodents, or leaves can get into the gaps in the pipes and decompose inside, causing serious foul odors.<\/li>\n<\/ul>\n\n\n\n
2. Effective methods for deodorizing and cleaning air ducts.<\/h2>\n\n\n\n
Depending on whether the pipeline is square or round, you can apply the following technical solutions:<\/p>\n\n\n\n
Regular mechanical cleaning<\/h3>\n\n\n\n
This is a crucial measure to protect the building's "lungs.".<\/p>\n\n\n\n
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- For spiral round ducting (Sao Viet's flagship product):<\/strong>\u00a0Thanks to their smooth, rounded shape with no dead corners, spiral round ducts are extremely easy to clean. You simply need to use an industrial vacuum cleaner with a round brush to sweep away dust and dirt, then gently wipe with a damp cloth.<\/li>\n\n\n\n
- For square ductwork:<\/strong>\u00a0The 90-degree corners are where dust accumulates most stubbornly. The process requires opening multiple inspection doors or disassembling individual sections to scrape away the accumulated dust.<\/li>\n<\/ul>\n\n\n\n
Sterilization using modern technology<\/h3>\n\n\n\n
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- Specialized chemicals:<\/strong>\u00a0Spraying a stream of sterilizing biological mist into the pipe eliminates mold spores completely without corroding galvanized steel or stainless steel surfaces.<\/li>\n\n\n\n
- Installing UV-C lamps:<\/strong>\u00a0Using a system of short-wavelength ultraviolet (UV) lamps installed in a box or main duct, the system destroys the DNA structure of bacteria as the airflow passes through.<\/li>\n<\/ul>\n\n\n\n
3. Comparison table of dust accumulation and cleaning capabilities between different duct types.<\/h2>\n\n\n\n
Technical criteria<\/strong><\/td> Spiral round air duct<\/strong><\/td> Square air duct<\/strong><\/td><\/tr><\/thead> Dust-attracting ability<\/strong><\/td> Very low (Smooth airflow, no dead zones)<\/td> Tall (Easily gets stuck at 90-degree angles)<\/td><\/tr> Ease of cleaning<\/strong><\/td> Easy, time-saving 50%<\/td> Complex, requires multiple access points.<\/td><\/tr> Air flow rate<\/strong><\/td> Optimize and reduce pressure loss.<\/td> On average, it's easy to create eddies.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n 4. Operational advice from Sao Viet experts<\/h2>\n\n\n\n
To ensure your ventilation system consistently supplies "clean" fresh air, your technical team should follow this checklist:<\/p>\n\n\n\n
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- Maintenance frequency:<\/strong>\u00a0Perform regular duct cleaning.\u00a0every 6 months<\/strong>\u00a0for office, residential and\u00a0every 3 months<\/strong>\u00a0Suitable for factory environments and industrial kitchens.<\/li>\n\n\n\n
- Upgrade your filters periodically:<\/strong>\u00a0Replace the pre-filter and intermediate filter regularly to prevent fine dust from penetrating deep into the main duct.<\/li>\n\n\n\n
- Choose the right materials from the start:<\/strong>\u00a0Use galvanized or stainless steel spiral round ducting with high sealing (meeting TDC\/TDF flange standards or smooth connections) to prevent insects and moisture from entering from the outside.<\/li>\n<\/ol>\n\n\n\n
Sao Viet \u2013 A manufacturer of high-quality air ducts in Northern Vietnam.<\/h2>\n\n\n\n
If your duct system is too old, severely rusted, and cannot be repaired by normal cleaning methods, replacing part or all of the system is the best solution.<\/p>\n\n\n\n
Vietnamese Stars<\/strong> Specializing in manufacturing and distribution:<\/p>\n\n\n\n
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- Modern spiral round ducting:<\/strong>\u00a0High aesthetic appeal, perfect airtightness, and easy maintenance.<\/li>\n\n\n\n
- Square ducting and accessories:<\/strong>\u00a0Available in various sizes to suit any ceiling design.<\/li>\n\n\n\n
- Fire-resistant ducting EI30 \u2013 EI45 \u2013 EI60:<\/strong>\u00a0Fully certified for fire safety inspection.<\/li>\n<\/ul>\n\n\n\n
![\"\"](\"https:\/\/onggiosaoviet.vn\/wp-content\/uploads\/2026\/05\/DND03994-1024x683.jpg\")
<\/figure>\n\n\n\n - Square ducting and accessories:<\/strong>\u00a0Available in various sizes to suit any ceiling design.<\/li>\n\n\n\n
- Upgrade your filters periodically:<\/strong>\u00a0Replace the pre-filter and intermediate filter regularly to prevent fine dust from penetrating deep into the main duct.<\/li>\n\n\n\n
- Installing UV-C lamps:<\/strong>\u00a0Using a system of short-wavelength ultraviolet (UV) lamps installed in a box or main duct, the system destroys the DNA structure of bacteria as the airflow passes through.<\/li>\n<\/ul>\n\n\n\n
- For square ductwork:<\/strong>\u00a0The 90-degree corners are where dust accumulates most stubbornly. The process requires opening multiple inspection doors or disassembling individual sections to scrape away the accumulated dust.<\/li>\n<\/ul>\n\n\n\n
- Mold growth:<\/strong>\u00a0Central air conditioning systems can easily accumulate condensation when they stop working suddenly. The temperature difference creates conditions for mold to grow, producing a characteristic musty smell.<\/li>\n\n\n\n