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MOTOR POSITIONS
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Belt Driven Centrifugal Fans
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Positions W & Z are the most compact if motor will
fit close to fan. With the current trend to fans on unitary bases (Arrgt. 9H), this
is more common than ever. Positions X & Y will typically take more space.
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The first sketch on the left shows the motor close to
the fan shaft but it may be more practical to move it out so that a standard adjustable
motor slide base will give a greater adjustment range for belt tension. Longer belt
centers also result in higher horse power.
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Arrangement 9 Motor Base Positions
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A/9R - Arrangement 9 with motor on right side of
the bearing pedestal.
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A/9L - Arrangement 9 with motor on left side of
the bearing pedestal.
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A/9T - Arrangement 9 with motor on top of the fan
housing.
A/9SL - Arrangement 9 with motor on left side of fan housing.
A/9SR - Arrangement 9 with motor on right side of fan housing.
Note: RIGHT and LEFT are viewed from the drive side.
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Axial and Inline Centrifugal
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A/1L - Arrangement 1 with motor on left.
A/1R - Arrangement 1 with motor on right.
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Although appropriate for Axial Fans, designations are
AMCA standard 99-2410-82 for Inline Centrifugal
Fans. Alternate designations are o'clock positions.
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45° =
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1:30
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225° =
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7:30
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90° =
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3:00
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270° =
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9:00
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135° =
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4:30
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315° =
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10:30
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180° =
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6:00
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360° =
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12:00
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