When considering using a website as a source, evaluate it using the CRAAP scale.
CURRENCY/ TIMELINESS: When the information was published and the importance of the date as it relates to the topic.
RELEVANCE/ COVERAGE OF THE TOPIC: The degree to which the information fulfills your information need.
AUTHORITY: Who is providing this information and are they a reliable source?
ACCURACY: The truthfulness and correctness of the information.
PURPOSE: The reason the Web page/site exists, and the point of view of the author/sponsor.
ADI Duct Size Calculator, Air Distribution Institute This site requires membership
Manual S – Residential Equipment Selection, 2014 Edition, Air Conditioning Contractors of America
Uniform Mechanical Code, International Association of Plumbing and Mechanical Officials
International Mechanical Code, International Code Council, Inc.
International Fuel Gas Code, International Code Council, Inc.