I believe the key here is in the definition of "equipment". Rule 4 is silent on leaf blowers; it basically states what is and isn't allowed with commonly used items. What you may not do is use or do anything that gives you an unfair advantage, therefore unless there is a local rule prohibiting leaf blowers, using one should be ok as long as your group are the only players in the match and you clear the green for all the other players in your group too.
But I admit I am stretching it. To me, if you are just out there for fun, go ahead.