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2. Air sanitizer - Wikipedia

   en.wikipedia.org/wiki/Air_sanitizer

   Air circulators treat a fractional room volume per unit time and exhaust the treated air back into the room, resulting in fractional air dilution. By contrast, air sanitizers that are maintained at a sufficient and homogeneous concentration within the interior air space provide simultaneous treatment of the entire interior air space volume but ...

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

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

   How to Clean Your Air Ducts If you do decide to clean your own air ducts, our step-by-step guide can help you do it correctly. You can also make things easy on yourself by choosing the right HVAC ...

4. 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]

5. 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 .

6. Ductwork airtightness - Wikipedia

   en.wikipedia.org/wiki/Ductwork_airtightness

   Ductwork airtightness can be defined as the resistance to inward or outward air leakage through the ductwork envelope (or ductwork shell). This air leakage is driven by differential pressures across the ductwork envelope due to the combined effects of stack and fan operation (in case of a mechanical ventilation system).

7. Duct leakage testing - Wikipedia

   en.wikipedia.org/wiki/Duct_leakage_testing

   Duct leakage test in the US. A duct leakage tester is a diagnostic tool designed to measure the airtightness of forced air heating, ventilating and air-conditioning (HVAC) ductwork. A duct leakage tester consists of a calibrated fan for measuring an air flow rate and a pressure sensing device to measure the pressure created by the fan flow.