Coverage. covers engineering data required for the design@ rating and purchase of air exchange coolers for packaged compressor units. A standard from for specifying the data is provided. Policy. Nothing contained in this specification is to be construed as granting any right@ by implication or otherwise@ for manufacture@ sale or use in connection with any method@ apparatus@ or product covered by letters patent@ nor as insuring anyone against liability for infringement of letters patent@ This specification is for the convenience of purchasers and manufactures in ordering and producing air exchange coolers. It is not intended to inhibit purchasers and producers from purchasing and producing air exchange coolers meeting specifications other than those contained herein; nor it intended in any way to inhibit purchasers from purchasing air exchange coolers from companies not authorized to use the API monogram.