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© FANTECH O-2 operating satisfactorily. 1.0AXIAL FANS © FANTECH O-3INSTALLATION DOS AND DONTSINSTALLATION DOS ANDDONTS Figure 1.4. - Duct restrictions at fansDucts significantly smaller than the fan diameter create turbulence if transitions connect directly to fan. An abrupt duct expansion at fan inlet causes air separation fromthe duct, starves the impeller tips, creates turbulence, reducesDuct expansions on the inlet to axial flow fans should beavoided where at all possible.If essential the transition should have an included angle of notmore than 15°. 1.0AXIAL FANS (Cont.)Figure1.3. - Flexible connection to fan of air. Fan performance is reduced and noise levels increased. O Installation Dos and Donts.qxd 4/03/2008 4:12 PM Page 3 © FANTECH O-5INSTALLATION DOS AND DONTSINSTALLATION DOS ANDDONTS FlexibleConnector Figure 1.8. - GuardsSafety of personnel around rotating machinery is crucial. FlexibleConnector personnel and machinery. In addition it may be illegal and leave 1.0AXIAL FANS (Cont.) The impeller can be starved of air when the inlet to the fan isobstructed. This effectively increases the system resistanceThis applies to all fan types.Allow a gap at least equal to one fan diameter between the fanintake and nearby obstructions, even then fan performance canAlways fit an inlet cone on open axial fan inlets. O