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ASHRAE Membership

ASHRAE membership is open to any person associated with heating, ventilation, air conditioning or refrigeration. ASHRAE is unique because its membership is drawn from a wide range of disciplines relating to the HVAC&R field. Over 55,000 individuals from more than 100 nations belong to the Society.

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ASHRAE members earn 15% off publications. Hundreds of titles are available including the complete collection of ASHRAE Standards including 90.1, 62.1 and 189.1.
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When you join ASHRAE, you are making an investment in yourself. When you become active in the Society by giving your time and sharing your knowledge, you get even more out of that investment.

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Resources & Publications

Duct Fitting Database

Software Download for Easy Viewing, Input and Navigation


$199 (ASHRAE Member $169) / 2016 / Software Download

This database, available as downloadable software, includes loss coefficient tables for more than 200 round, rectangular, and flat oval duct fittings.

Featuring pictorial outlines of each fitting, this database is useful to design engineers dealing with a variety of duct fittings. For any given fitting, enter the flow rate and fitting information and obtain loss coefficient data and associated pressure loss. The product includes table data for supply, exhaust, and common (supply/return) duct functions. Fittings may be saved into a project file, which is easily navigated and is small enough to be stored and transferred.

This software offers an integrated database; fully available input, output, calculations, and table data properties; and easily viewable calculations that update in real time.

Purchasers receive a downloadable .exe file of ASHRAE DFDB ver. 6.00.05 as well as complimentary access to the beta version of ASHRAE DFDB.

Get the App for your iPhone, iPod, or iPad

Duct Fitting Database (DFDB) for the iPhone, iPod touch, and iPad allows you to perform pressure loss calculations for ASHRAE duct fittings in both I-P and SI units. Use this mobile app in the field for quick duct pressure loss calculations. The inputs can be adjusted by touch, and installation is automatic. Purchase this product from iTunes for $9.99 Learn More

The Standard:

Standard 120-2008 --Method of Testing the Determine Flow Resistance of HVAC Ducts and Fittings

ASHRAE Standard 120 establishes uniform methods of laboratory testing of HVAC ducts and fittings to determine their resistance to airflow.