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13. Install airfoils
Tilt airfoil so that tip is angled upward as shown. Slide airfoil into slot on side of motor
unit, and then tilt downward into place. Install each airfoil on opposite side of fan from
previous airfoil to prevent fan from tilting (Fig. 13.1). Make sure numbered sticker on
each airfoil matches corresponding slot number on bottom of fan. Ensure all airfoils
are fully seated in slots before tightening screws on bottom of fan.
Fig. 13.1
Airfoil
Tighten the six airfoil screws on bottom of fan according to numbered sequence
(Fig. 13.2). When fi nished, repeat tightening sequence. Verify all six screws are fully
tightened by making sure the tabs next to holes 1 and 5 are fl ush with the openings.
Fig. 13.2
11
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