DFO-103
52Pages

CHICAGO BLOWER CORPORATION • GLENDALE HEIGHTS, ILLINOIS •

High Volume High Efficiency DESIGN 51 Airfoil Fans Chicago’s Design 51 is a hollow bladed airfoil centrifugal fan, acknowledged as the most efficient fan type for clean air applications.The Double-Width configuration carries an enviable reputation for fan performance and reliability in a multitude of HVAC installations plus many industrial supply or exhaust systems. For singlewidth or plenum fan applications, Chicago offers the same full range of 19 wheel sizes to meet most every requirement. 2 Double Width Performance Volumes to 425,000 CFM Pressures to 20" wg Sizes from 135 to...

PERCENT EFFICIENCY and HORSEPOWER PERCENT VOLUME Chicago Blower’s airfoil wheel provides static efficiencies exceeding 82%. Classes I, II, III available. Certified Ratings Chicago Blower Corporation certifies that the Design 51 Airfoil Fans shown herein are licensed to bear the AMCA seal. Ratings shown are based on tests and procedures performed in accordance with AMCA Publication 211 and comply with the requirements of the AMCA Certified Ratings Program. Performance shown is for Airfoil fans with inlets open and outlet ducted. Built-in Performance Chicago’s Design 51 airfoil wheel has...

Design 51RA For Low Pressure Applications Chicago offers Design 51 RA fans especially suited for certain lower pressure applications or installations. Chicago’s RA fans provide a viable alternative. Comparisons of the designs are shown on page 28 of our D/51 Double Width website bulletin. www.chicagoblower.com. Quick Selection Methods Chicago offers two methods of selecting the desired Design 51 fan. For those whose primary consideration is energy consumption, one method selects the most energy efficient fan size for any required duty. When the initial concern is maximum fan outlet...

Outlet Dampers Offered for all classes of fans, outlet dampers feature low initial cost and simple operation. However, they do not offer as large a horsepower savings at reduced air volume as the IVC. Outlet dampers have punched flanges on both ends to simplify fan and duct connections. Damper shafts are at right angles to fan shaft when possible. Parallel acting blades are standard with opposed blade design optional. To mount damper on the fan, a punched flanged outlet is needed. Flanged Outlet A continuously welded angle facilitates attaching flexible connectors matching the ductwork, or...

Quick Fan SelectionFor the Energy Efficient Fan Energy consumption is often a major consideration in every engineer’s equipment selection procedure. This Chicago Quick Selection Method selects the most energy efficient fan size for any required duty. To determine the most efficient fan size, locate the intersection of the required volume (CFM) and static pressure (SP) on the graph below. The area containing the intersection is labeled with the most efficient fan size. Example: Select a fan for 20,000 CFM at 3" SP. The intersection of 20,000 CFM and 3" SP shows a Size 365 as the most...

For Fans with Specified Outlet Velocities Many engineers specify a maximum fan outlet velocity. Chicago’s Quick Selection Method provides the smallest possible fan size that meets any specified outlet velocity limit. To size a fan with a specified maximum outlet velocity (O.V.), calculate a minimum fan outlet area (O.A.) using the formula below. Then select a fan from the table at right with an outlet area equal to or larger than the calculated minimum. Required Volime in Cubic Feet Per Minute, CFM Specified Maximum O.V. in Feet Per Minute, FPM Example: Select a fan for 43,000 CFM with a...

Performance Table Guide Pages 9 thru 47 contain multi-rating tables for every fan size. Each page provides data for one size ranging from 1/4" static pressure (SP) up to 20" SP. Volume is listed in cubic feet per minute, (CFM) and outlet velocity (VEL). Under each SP rating is the speed (RPM), and horsepower (BHP) required for each corresponding CFM rating. Simply interpolate between ratings for any value not listed. Ratings in bold italic type on each page are in the high efficiency selection range. (Refer to the graph on page 3.) Classes I, II and III are indicated by different color...

DESIGN 51 Double Width Airfoil FansSPEED LIMITATIONSOUTLET AREA -3542 RPM CLASS 11-4617 RPM CLASS 111-5818 RPM 1.89 SQ. FT. OUT CFM

DESIGN 51 Double Width Airfoil FansSPEED LIMITATIONS OUTLET AREA CLASS 1-3254 RPM CLASS 11-4242 RPM CLASS 111-5346 RPM 2.33 SQ. FT. OUT CFM

DESIGN 51 Double Width Airfoil FansSPEED LIMITATIONS OUTLET AREA CLASS 1-2881 RPM CLASS 11-3756 RPM CLASS 111-4733 RPM 2.82 SQ. FT. OUT CFM

DESIGN 51 Double Width Airfoil FansSPEED LIMITATIONS OUTLET AREA CLASS 1-2639 RPM CLASS 11-3441 RPM CLASS 111-4342 RPM 345 SQ. FT. OUT CFM

Size 200 SPEED LIMITATIONS CLASS 1-2355 RPM CLASS 11-3071 RPM CLASS 111-3869 RPM Performance shown is for Design 51 with outlet duct. BHP does not include V-belt drive loss.

Size 222 _ SPEED LIMITATIONS CLASS 1-2202 RPM CLASS 11-2870 RPM CLASS 111-3616 RPM Performance shown is for Design 51 with outlet duct. BHP does not include V-belt drive loss.

DESIGN 51 Double Width Airfoil FansSPEED LIMITATIONS OUTLET AREA CLASS 1-1691 RPM CLASS 11-2204 RPM CLASS 111-2778 RPM 7.54 SQ. FT. OUT CFM

DESIGN 51 Double Width Airfoil FansSPEED LIMITATIONS OUTLET AREA CLASS 1-1555 RPM CLASS 11-2028 RPM CLASS 111-2555 RPM 9.31 SQ. FT. OUT CFM

DESIGN 51 Double Width Airfoil FansSPEED LIMITATIONS OUTLET AREA CLASS 1-1416 RPM CLASS 11-1846 RPM CLASS 111-2326 RPM 11.27 SQ. FT. OUT CFM

DESIGN 51 Double Width Airfoil FansSPEED LIMITATIONS OUTLET AREA CLASS 1-1333 RPM CLASS 11-1698 RPM CLASS 111-2140 RPM 13.79 SQ. FT. OUT CFM

DESIGN 51 Double Width Airfoil FansSPEED LIMITATIONS OUTLET AREA CLASS 1-1143 RPM CLASS 11-1491 RPM CLASS 111-1879 RPM 16.77 SQ. FT. OUT CFM

DESIGN 51 Double Width Airfoil FansSPEED LIMITATIONS OUTLET AREA CLASS 1-1040 RPM CLASS 11-1356 RPM CLASS 111-1708 RPM 20.49 SQ. FT. OUT CFM