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The current version, AMCA 230–12, reintroduced airflow rate with a revised equation, and new efficiency metrics. The official scope of the standard was limited to ceiling fans under 6 feet (1.8 m) in diameter. [9] Therefore, the current standard does not apply to HVLS fans. A new version of the standard is currently under review.
Air naturally stratifies, i.e. warmer air rises to the ceiling while cooler air sinks, meaning that colder air settles near the floor where people spend most of their time. A ceiling fan, with its direction of rotation set so that the warmer air on the ceiling is pushed down along the walls and into the room, heating the cooler air.
Window and central air conditioning in the 1960s caused many companies to discontinue production of fans, [12] but in the mid-1970s, with an increasing awareness of the cost of electricity and the amount of energy used to heat and cool homes, turn-of-the-century styled ceiling fans became popular again as both decorative and energy-efficient.
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A tribute to Cobain, it is called "Daughter/Hey Hey, My My" by fans, since the extension is from the Neil Young song "Hey Hey, My My (Into the Black)", which Cobain's suicide note had quoted. Another popular tag of the song is the "It's Okay" tag, which includes a slow improvisation based on "It's Okay" by garage rock band Dead Moon .
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