http://www.google.rs/url?sa=t&rct=j&q=&esrc=s&source=web&cd=...
9. WARNING! Due to European safety regulations, if the flush mount option is elected, the fan must not be re-installed utilizing the downrod. If attempted, this may cause a serious injury. Please consult with local regulations should you have any questions about this important safety requirement.
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9. UPOZORENJE U skladu s evropskim propisima, ako se postavlja izravno na strop, pri ponovnom postavljanju ne smijete koristiti noseću cijev. Ako to pokušate, moglo bi doći do teške povrede. Ukoliko ste u nedoumici glede ovog važnog pitanja, proučite pažljivo lokalne norme.

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Note added at 1 day2 hrs (2014-04-04 09:11:24 GMT)
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To jeste cijev, kroz nju se provlače el. vodiči a istovremeno nosi telo ventilatora.:
http://www.ehow.com/how_6174383_replace-ceiling-fan-down-rod...
How to Replace a Ceiling Fan Down Rod
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Fish the ceiling fan's wires through the bottom of the new down rod. Once the down rod is in place, insert the pin and secure it with the clip. Tighten down the screws that surround the base of the down rod.

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Note added at 1 day3 hrs (2014-04-04 09:35:38 GMT)
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http://realestate.msn.com/article.aspx?cp-documentid=1310810...
4. Ceiling height: Most companies recommend a 9-foot fan-to-floor distance. To accommodate taller ceilings, you’ll need an extension, or down rod. For example, if you have an 11-foot ceiling, your down rod should be around 2 feet, bringing the fan to just the right distance above the floor. In rooms with low ceilings, fans can be flush-mounted without a down rod.