Fan Application product application guide

The air moving industry uses a common term todescribe certain inlet and outlet conditions thatadversely affect fan performance. The term used is"system effect". Perhaps the term should be "faninstallation effect", because system effect resultsfrom the difference in how the fan was tested,compared to how it is installed. To minimize systemeffects, air must enter or leave a fan let s take a look at how fans are tested andcataloged. Most fans available in today s marketbear AMCA Certified Rating Seals. This means thatthe fan manufacturer followed the test proceduresas outlined in AMCA Publication 210 and tested thefan in one of the standardized configurationsapproved by AMCA. One of the requirements ofAMCA, is that directly under the catalogedperformance for a given fan model, the fanmanufacturer must make a statement as to how thatproduct was tested. Paying attention to thesestatements is the first step in avoiding system statements for three different product typesare:Roof exhaust fans: Performance shown is forInstallation Type A: Free inlet, Free outlet.

2 ® Fan Application No. FA/101-99 Greenheck Product Application Guide Poor Poor Fig. 3 Fig. 4 Fig. 5 Figure 2 illustrates a poor installation with horizontal duct and an abrupt elbow at the fan

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