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2. How Often Should You Clean Your Air Ducts? Experts Explain - AOL

   www.aol.com/often-clean-air-ducts-experts...

   “The frequency of duct cleaning will be determined by the quality of the duct system, the filtration being used, the amount of airborne contaminants, and the hours of operation,” says Traci ...

3. No, You Don't Need to Clean Your Air Ducts Every Year ... - AOL

   www.aol.com/no-dont-clean-air-ducts-110500245.html

   "An inspection can help determine if air ducts need cleaning by checking for visible dust buildup, mold growth, or signs of pest infestations, offering a clear indication of when professional ...

4. Kitchen exhaust cleaning - Wikipedia

   en.wikipedia.org/wiki/Kitchen_exhaust_cleaning

   Kitchen exhaust cleaning (often referred to as hood cleaning) is the process of removing grease that has accumulated inside the ducts, hoods, fans and vents of exhaust systems of commercial kitchens. Left uncleaned, kitchen exhaust systems eventually accumulate enough grease to become a fire hazard.

5. Smoke damper - Wikipedia

   en.wikipedia.org/wiki/Smoke_damper

   The test and inspection frequency shall then be every 4 years, except in hospitals, where the frequency shall be every 6 years. The code also states that the damper shall be actuated and cycled. The inspections must be document indicating the location of the damper, date of inspection, name of inspector, and deficiencies discovered.

6. Indoor air quality - Wikipedia

   en.wikipedia.org/wiki/Indoor_air_quality

   Portable room air cleaners with HEPA filters can be used if ventilation is poor or outside air has high level of PM 2.5. [122] Air filters are used to reduce the amount of dust that reaches the wet coils. [citation needed] Dust can serve as food to grow molds on the wet coils and ducts and can reduce the efficiency of the coils. [citation needed]

7. Dust collector - Wikipedia

   en.wikipedia.org/wiki/Dust_collector

   A dust collector is a system used to enhance the quality of air released from industrial and commercial processes by collecting dust and other impurities from air or gas. Designed to handle high-volume dust loads, a dust collector system consists of a blower, dust filter, a filter-cleaning system, and a dust receptacle or dust removal system.