The average nail-on plastic ceiling box is rated for only supporting a 35 pound static load. They are also not fan-rated. This requires that the ceiling box be replaced with a fan-rated box before the installation of a ceiling fan. Fan-rated boxes are capable of holding 70 pound loads and are rated for this application. This is easier said than done! The nail-on products do not lend themselves to be reinforced easily since labor savings have also been applied to the construction of homes themselves. In many circumstance the average home does not have an attic, only a narrow crawl space between the trusses is provided. This combined with blow-in insulation makes the location of the ceiling box difficult if not impossible when a fan is to be hung on an upper floor.
Many have heard of the proverbial glass ceiling and how the phrase is euphemistically used to describe an unfair system that prevents people (i.e., women and minorities) from advancing in their professions. The plexiglass ceiling describes the same type of unfair system with additional rigor used to prevent advancements-plexiglass is 17 times stronger than glass. While glass ceilings denote an inability to see the barriers, plexiglass ceilings are not as transparent. The victims of plexiglass ceiling see the barriers, but do not recognize a way around them.
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