Air Conditioning - Major terms 1 | ArticlesBase.com

Air changes per hour (ACH) The number of times per hour that the volume of a specific room or building is supplied or removed from that space by mechanical and natural ventilation. Air handler, or air handling unit (AHU) Central unit consisting of a blower, heating and cooling elements, filter racks or chamber, dampers, humidifier, and other central equipment in direct contact with the airflow. This does not include the ductwork through the building. British thermal unit (BTU) Any of

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