Foaly is a centaur, and centaurs are usually pretty tall (maybe around 2.5 meters). However, Foaly lives and works with elves, who are around 1 meter tall. Scale everything up and that'd be like humans working with someone who's 4.5 meters tall (or around 15 feet). That doesn't really make sense to me, and doesn't seem to be supported by what I remember from the books, but it also doesn't make much sense that centuars in the Artemis Fowl world would be elf-sized.
So, is there any canon indication of how tall centaurs (specifically Foaly) are (is)?