Assume air velocity (V) = 1,500 ft/min (fpm). Standard air density. [ V_p = (V / 4005)^2 = (1500 / 4005)^2 = (0.3745)^2 = 0.14 , \textin. w.g. ]
: A "Lite" version is available for iPhone/iPad to perform basic pressure loss calculations. Legacy Formats : Older versions were distributed on CD-ROM (2008 version). Supplementary PDF Tables : ASHRAE provides specific Fitting Loss Coefficients as free supplemental material for certain textbooks. Sample Fitting Data (Typical Outputs) ashrae duct fitting database pdf
Let’s walk through a common scenario: calculating the pressure drop through a with a centerline radius equal to the duct width (r/W = 1.0). Assume air velocity (V) = 1,500 ft/min (fpm)
: Includes data for supply, exhaust, and common (supply/return) functions for various shapes. Calculation Logic Supplementary PDF Tables : ASHRAE provides specific Fitting
Whether you access the data via a PDF or the official software, the structure of the database is standardized. The fittings are categorized by shape and function, using a specific alphanumeric code system.