This National Voluntary Consensus Standard was developed under the auspices of the American Society of
Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE). Consensus is defined as “substantial
agreement reached by concerned interests according to the judgment of a duly appointed authority, after a
concerted attempt at resolving objections. Consensus implies much more than the concept of a single majority
but not necessarily unanimity” This definition is according to the American National Standards Institute (ANSI)
of which ASHRAE is a member. If an ASHRAE Standard has also been approved by ANSI as an American
National Standard, it is marked on the cover with the “ANSI” designation and ANSI approval date.