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How Strong is A7 Structural Steel?

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I am evaluating the ability of an existing roof to handle a new air handling unit.
 
The old plans call the steel beams out to be 12 WF 27, 21 WF 82, and 24 WF 100.  The note on the old plans say O.H. Steel ASTM A7.  I seem to recall that this designation implied that the steel yield strength is 30ksi vice 36ksi.  Is this correct? 
 
Thomas W. Bodkin, E.I.T.
Carroll Engineering Corporation
 
Phone: 215-343-5700 x360
Fax: 215-343-0875