Myth vs Truth: is this number 13 unlucky?

In many apartment/office buildings worldwide including in vietnam, the developers have removed the number 13 out of their development property floor numbers, as they and the majorities believe the number 13 is the unlucky number.

Is this true or not?

In the chinese metaphysics in a general speaking and fengshui in particular, there is no term of unlucky number 13. In fact under the root of these numbers in term of five elements, 1 represents water element, 3 represents wood element. they are in producing cycle, no clashing, no conflicting of elements, so why need to avoid??? and the round up these numbers is 4, also represents for wood element.

In flying stars or late heaven fengshui, the combo of 13 is considered as an auspicious and used to open door and place stove, bed, working desk direction as this combination harmonizes in elements and can help people generating wealth from their intelligence as 1 represents intelligence star and 3 represents wealth star.

From our own experience and the above points of view, it is only a myth or supertition seeing that the number 13 as unlucky combination.