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2. Heating, ventilation, and air conditioning - Wikipedia

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

   Warm air systems distribute the heated air through ductwork systems of supply and return air through metal or fiberglass ducts. Many systems use the same ducts to distribute air cooled by an evaporator coil for air conditioning. The air supply is normally filtered through air filters [dubious – discuss] to remove dust and pollen particles. [15]

3. 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 ...

4. Testing, adjusting, balancing - Wikipedia

   en.wikipedia.org/wiki/Testing,_adjusting,_balancing

   Adjusting is the final setting of balancing devices such as dampers and valves, adjusting fan speeds and pump impeller sizes, in addition to automatic control devices such as thermostats and pressure controllers to achieve maximum specified system performance and efficiency during normal operation.

5. Bitter cold in forecast: December set for 'coldest start' in ...

   www.aol.com/bitter-cold-forecast-december-set...

   Through Dec. 9, the western half of the U.S. is forecast to have above normal or near normal temperatures, the agency says. The extended U.S. temperature forecast for Dec. 5-9.

6. Do other countries have credit scores? - AOL

   www.aol.com/other-countries-credit-scores...

   The United States maintains a unique credit scoring framework. Other countries use different scoring systems, so you need to start fresh if you move internationally. The financial habits that help ...

7. Air Movement and Control Association - Wikipedia

   en.wikipedia.org/wiki/Air_Movement_and_Control...

   ANSI/AMCA Standard 510 - Methods of Testing Heavy Duty Dampers for Rating establishes testing methods to be used in measuring the performance of dampers generally described as “custom design,” “heavy duty” or “severe service” normally used in applications where elevated temperature, erosion and/or corrosion conditions exist ...