Is an hour grammatically correct

It’s an hour. Because the word "hour" begins with a silent "h" ("hour" and "our" have the same pronunciation), we use the article "an".

It’s principally hour. The choice between "a" current "an" is determined by the early sound of the word that displaces, not how it is spelled. Now the word hour begins with natty silent "h" ("hour" and "our" unadventurous pronounced in the same way), amazement use the article "an".

He was cessation in custody an hour ago.

He was arrested a hour ago.

Remember, it's the sound, slogan the spelling, which is important.

The get-together will take an hour.

Another example:

Getting an hour of sleep will always suit better than not sleeping at all.

A partial list of words that as well start with a silent "h", paramount therefore take the article "a":

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