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2. 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 ...

3. 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]

4. Air purifier - Wikipedia

   en.wikipedia.org/wiki/Air_purifier

   An air purifier or air cleaner is a device which removes contaminants from the air in a room to improve indoor air quality. These devices are commonly marketed as being beneficial to allergy sufferers and asthmatics , and at reducing or eliminating second-hand tobacco smoke .

5. Sick building syndrome - Wikipedia

   en.wikipedia.org/wiki/Sick_building_syndrome

   Common products such as paint, insulation, rigid foam, particle board, plywood, duct liners, exhaust fumes and other chemical contaminants from indoor or outdoor sources, and biological contaminants can be trapped inside by the HVAC AC system. As this air is recycled using fan coils the overall oxygenation ratio drops and becomes harmful.

6. Duct (flow) - Wikipedia

   en.wikipedia.org/wiki/Duct_(flow)

   Downstream of the air handler, the supply air trunk duct will commonly fork, providing air to many individual air outlets such as diffusers, grilles, and registers. When the system is designed with a main duct branching into many subsidiary branch ducts, fittings called take-offs allow a small portion of the flow in the main duct to be diverted ...

7. 25 Nifty Cleaning Products That Are Worth Every Penny - AOL

   www.aol.com/25-nifty-cleaning-products-worth...

   Clean Freak 101. There are so many cleaning products to choose from, whether you're looking for an all-purpose cleaner or something to polish your wood furniture with.