In this 2nd public review draft the Reynolds number equation was re-written in a different format (Section 6.3.3), the description of the duct losses (Section 7.3.3.3) was also re-written to more accurately represent a method for calculating these losses, and all references were updated to show their latest revised versions. All other changes were editorial, such as ensuring consistency in the use of words or phrases to agree with the terminology presented in the ASHRAE Fundamentals Handbook.