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

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

   How much does duct cleaning cost? Air duct cleaning costs are determined by a variety of factors, including accessibility, vent locations, area of the home, and the size. The costs can range from ...

3. Heating, ventilation, and air conditioning - Wikipedia

   en.wikipedia.org/wiki/Heating,_ventilation,_and...

   Air handling unit, used for heating, cooling, and filtering the air. Air cleaning and filtration removes particles, contaminants, vapors and gases from the air. The filtered and cleaned air then is used in heating, ventilation, and air conditioning. Air cleaning and filtration should be taken in account when protecting our building environments ...

4. Air conditioning - Wikipedia

   en.wikipedia.org/wiki/Air_conditioning

   The efficiency of air conditioners is often rated by the seasonal energy efficiency ratio (SEER), which is defined by the Air Conditioning, Heating and Refrigeration Institute in its 2008 standard AHRI 210/240, Performance Rating of Unitary Air-Conditioning and Air-Source Heat Pump Equipment. [61]

5. Duct (flow) - Wikipedia

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

   Ducts for air pollution control in a 17000 standard cubic feet per minute regenerative thermal oxidizer (RTO). A round galvanized steel duct connecting to a typical diffuser Fire-resistance rated mechanical shaft with HVAC sheet metal ducting and copper piping, as well as "HOW" (Head-Of-Wall) joint between top of concrete block wall and underside of concrete slab, firestopped with ceramic ...

6. Ground support equipment - Wikipedia

   en.wikipedia.org/wiki/Ground_support_equipment

   Time-lapse of ground support equipment in use at Osaka International Airport, Osaka, Japan. Ground support equipment (GSE) is the support equipment found at an airport, usually on the apron, the servicing area by the terminal. This equipment is used to service the aircraft between flights.

7. Hartsfield–Jackson Atlanta International Airport - Wikipedia

   en.wikipedia.org/wiki/Hartsfield–Jackson...

   On January 18, 1990, Eastern Air Lines Flight 111, a Boeing 727, overran a Beechcraft King Air operated by Epps Air Service, based at another Atlanta airport. The King Air had landed and was taxiing when the 727, still at high speed in its landing roll, collided with the aircraft. The larger plane's wing impacted the roof of the smaller.