Ho rakhang (hor rakang; Thai หอระฆัง), in English, the bell tower or bellfry.

The bell tower appears in every temple and has no fixed style or form. The bell is sounded (but not in Mechelen ...) to announce the time in the morning and the evening.   

An important moment is 11 o'clock when the last meal of the monks is announced.

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In the temples in the East we see, besides the bell tower, a drum tower (Thai: ho klong หอกลอง). Often the bell and the drum are combined in the same small building.

The pictures on the left show an example in Wat Ban Nong Pla Keng (Si Sa Ket province, Thailand) with, as often is the case, the bell made in wood.  

A nice example can be found on the link: Wat Kham Chanot