（Mall property grease duct cleaningMethods for cleaning exhaust ducts | How often should exhaust ducts be cleaned
Section 1: Grease Duct Cleaning Methods
1. For home kitchen exhaust pipes, regular consumers can clean them using kitchen cleaners at home. However, for larger exhaust pipes, professional personnel must enter the flue to perform cleaning.
2. For narrow exhaust outlets where humans cannot enter the flue or where the flue is too narrow to reach for cleaning, yet poses significant hazards, use high-pressure water with cleaning agents or lye. If necessary, use hydrochloric acid for cleaning, ensuring no residue. If hydrochloric acid is used, it must be immediately rinsed with clean water using disassembly methods. This method provides thorough and effective cleaning, but it is labor-intensive, requires a large workforce, and is relatively expensive.

3. Cleaning Solutions
1) Technicians, based on the actual condition of the flue, calculate the distance at which to dismantle sections of the flue and extend the cleaning in both directions to ensure thorough cleaning and maintain the quality of the cleaning.
2) Drilling Method: This method is relatively easier and less expensive compared to disassembly, but it also has a slightly lower cleaning effect. The specific process is as follows: technicians measure the required spacing, drilling positions, sizes, and quantities. Cleaning is performed through these holes in the chimney. Each hole is sealed after the cleaning.

Section 2: How often should grease ducts be cleaned?
1. The smoke hood and flue entrance within 1 meter of the kitchen operation area in catering businesses should be cleaned daily.
2. The exhaust ducts in Chinese-style kitchen operations should be cleaned at least once every 60 days.
3. Vertical flue pipes typically accumulate less oil, allowing for a cleaning once a year.
4. Large range hoods should be thoroughly cleaned quarterly to promptly remove any adhered and accumulated grease and dirt, preventing excessive buildup in the flue and exhaust ducts that could pose a fire hazard.

Section 3: Grease Fume Duct Cleaning Standards
After cleaning, over 90% of the flue can reveal the original inner metal color, without any stubborn oil stains in lumps. The stove surface is free of oil stains and shiny and tidy. Over 90% of the fan blades' surface can be seen to have the base paint, the motor bottom has no accumulated oil stains, and the external pipes have no oil stains or stubborn residues.