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This question already has an answer here:

IS HR an acronym? Should "a" or "an" be used in front of it in a sentence, such as: Do you have an HR question?

marked as duplicate by TimLymington, Hellion, choster, tchrist, anongoodnurse Apr 30 '14 at 23:27

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Since phonetically "H" begins with an "A" sound, one would use "an" instead of "a". For example, FBI would also utilize "an" instead of "a" since "F" is an "Ef" sound. Since the acronym begins phonetically with a vowel, one needs to use "an", the article which preceeds regular words which begin with vowels.

Source: http://grammar.ccc.commnet.edu/grammar/abbreviations.htm

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    Nice answer, I arrived at the same conclusion. – Azar Apr 30 '14 at 15:55

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