Moreover the magnitude of that downward force increases with blade length.
Ceiling fan rated box.
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Presuming you don t have access to the ceiling fan from above you must either use a specially rated hanger and box to mount the fan between joists or better yet screw a fan rated pancake box so called because it s very thin directly to a ceiling joist.
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Like all fans a box fan s power is measured by how much air movement it provides.
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Airflow is typically rated in cubic feet per minute cfm which helps indicate how quickly a fan can move the air in a given area.
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Round ceiling fan and.
For example a box fan that s rated at 2 000 cfm will cool a room of 2 000 cubic feet in one minute.
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Ceiling fans not only weigh more than light fixtures but they vibrate which adds to the downward force exerted on the box.
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The national electric code requires that all fans 35 pounds and over must be supported with an outlet box or outlet box system that is listed for ceiling fan support.
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However because paddle fans can be supported independently of the outlet box and fans can be installed at luminaire locations with no spare conductors i suppose the irony of installing fan rated boxes where fans are not installed and installing non fan rated boxes where fans are installed will simply continue.
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