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> into your central vac outlet.

Is that something common? Never seen that, never heard of it, had to google to find out what it is. Maybe that's more of an US(?) thing and too specific?

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It exists, but it's not that common. My uncle (in Belgium) had one in his house in the nineties, with mixed opinions. Every x years there's some hype around central vacuum cleaner systems in the building industry, but the excitement is always short lived: no matter the improvements, it's still vacuuming. And most people don't like to do that very often.

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