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                PROPELLER BLADES
 HEAVY DUTY STEEL BLADES FOR VENTILATORS AND CONDENSING UNITS
WIDE, SQUARE BLADES ARE DESIGNED SPECIFICALLY FOR HIGH STATIC PRESSURE TO FORCE AIR THROUGH HEATING OR COOLING COILS.
You must always specify “CLOCKWISE" or "COUNTER-CLOCKWISE" construction of each blade. The illustration is of a CLOCK- WISE blade. Note that when you face this blade, it must be rotated CLOCKWISE in order to blow air toward you.
   ORDER BY DIAMETER, PITCH, WING COUNT, AND DIRECTION.
EXAMPLE: Part Number 20-27-4CCW is a counter-clockwise, 20" 4-wing blade with a 27o pitch. A 6-pole (1050-1140 RPM) motor should be 1/5 HP for ventilators or 1/3 HP for condensing units.
PART NUMBER REFERENCE
 Part No. Add Rotation Dia. ...Pitch ..Wings
10 ........23 .............4
10 ........27 .............3
Part No. Add Rotation Dia. ...Pitch ..Wings
Part No. Add Rotation Dia. ...Pitch ..Wings
20 ........33 .............4
                           10 ........27 .............4 10 ........33 .............4 12 ........19 .............4 12 ........23 .............3 12 ........23 .............4 12 ........27 .............4 12 ........33 .............4 14 ........19 .............4 14 ........23 .............3 14 ........23 .............4 14 ........23 .............5 14 ........27 .............3 14 ........27 .............4 14 ........27 .............5 14 ........33 .............4 16 ........19 .............3 16 ........23 .............3 16 ........23 .............4
16 ........27 .............4 16 ........27 .............5 16 ........33 .............4 16 ........33 .............5 18 ........27 ...........2+ 18 ........27 .............3 18 ........27 .............4 18 ........27 .............5 18 ........30 .............3 18 ........30 .............4 18 ........33............2* 18 ........33 .............3 18 ........33 .............4 18 ........33 .............5 20 ........25 ...........2+ 20 ........27 .............3 20 ........27 .............4 20 ........27 .............5 20 ........30 .............3 20 ........30 .............4 20 ........33 .............3
20 ........33 .............5 22 ........27 ...........2+ 22 ........27 .............3 22 ........27 .............4 22 ........27 .............5 22 ........33 .............3 22 ........33 .............4 22 ........33 .............5 24 ........27............2* 24 ........27 .............3 24 ........27 .............4 24 ........27 .............5 24 ........33 .............3 24 ........33 .............4 24 ........33 .............5 26 ........24 .............4 26 ........27 .............4 26 ........27 .............5 26 ........33 .............4 26 ........33 .............5
                      + Available in CCW only (Revcor) * Has 1/2" hub installed. CCW only (Lau)
FAN PITCH & ROTATION GAUGE
CENTER HUBS
MUST BE ORDERED SEPARATELY
  Tell at a glance the degree of pitch & direction of ro- tation (CW or CCW) or any size fan blade. Position flat end (B) of gauge shaft on flat surface of fan hub & Base (A) of gauge on surface of fan blade. Gauge will indicate rotation and degree of pitch.
CENTER HUB WITH MOUNTING SCREWS
   05099801
AH14 1/4" AH516 5/16" AH38 3/8" AH12 1/2" AH58 5/8"
AND SET SCREWS, ORDER BY SHAFT SIZE.
                     Prices subject to change without notice AH34 3/4" © 1971- 2018 w.d. armstrong corp.
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