Bulletin DFOS 103 DESIGN 51 Bulletin DFOS 103 DESIGN 51 SINGLE WIDTH AIRFOIL FANS AN ISO 9001 COMPANY CHICAGO BLOWER CORPORATION

High Volume High Efficiency The heart of Chicago’s Design 51 centrifugal fan is the airfoil wheel, the most efficient type for Single Width Airfoil Fans clean air applications. This fan has an enviable reputation for performance and reliability in a multitude of applications, including industrial supply or exhaust systems. The Design 51 singlewidth is a rugged fan built to Chicago’s industrial level of quality and long-term dependability. Single-width fans are offered in Sizes 135 to 890, with pressures to 20" WG and volumes to 220,000 CFM. Construction flexibility is one of the strengths of...

Airfoil Wheel Performance Widely recognized for design efficiency and integrity, Chicago’s Design 51 airfoil wheel has ideal characteristics for variable air volume systems. With a smooth, steep pressure curve, major changes in pressure will cause only minor changes in volume. The broad high-efficiency operating range offers extensive selections and capabilities within each fan size. The fan's deep spun inlet and hyperbolic wheel cone plus generous housing proportions provide a smooth stable air flow over the entire performance range. Precision balancing assures quieter vibration-free operation...

Performance and Convenience Options Inlet Volume Control The Inlet Volume Control (IVC) provides precise air control and more efficient performance at partial loads. Adjustable guide vanes pre-spin the incoming air in the same rotation as the wheel to produce the desired volume of air at the exact pressure. Vanes are mounted entirely within the inlet cone.The IVC is suitable for manual or automatic operation. Shaft Seal Flanged/ Slip Inlet The compressed sheet seal mounted between steel side shaft opening. Shaft seals are not gas tight. plates is designed to reduce leakage through the drive accessory...

Unitary Base Fan and adjustable motor base are welded onto a unitary base of continuously welded structural steel channel. Vibration isolators also available. (Refer to page 30 for base dimensions.) Shaft and Bearing Guard The expanded metal guard encloses the shaft and bearings from the housing side to just beyond the outboard bearing. Extended grease fittings are recommended. Belt Guard Three sides are fully enclosed with expanded metal on the fourth side for ventilation and visual inspection. Easily removed for drive servicing. Access Doors The flush mounted door features quick-locking compression...

TABLE I Temperature and Altitude Correction Note: For derating max. speeds due to high temperature, not operational capabilities. R/F: Refer to Factory. x .98 = 2161. Thus, the maximum allow- When working with lower pressure, typically below 5" SP, and space able fan speed is 2161 RPM. and initial cost are primary considerations, the alternate Design 51RA b. Check the above maximum allowable fan speed against the selected fan RPM. Since the fan operating speed of 1749 RPM is within safe limits of the maximum allowable of 2161 RPM, the size 222 Class I fan will deliver 5500 CFM at 2" SP, 400°F...

CHICAGO BLOWER SINGLE WIDTH AIRFOIL 35 13-7/32 In. Wheel Diameter 1.05 Sq. Ft. Outlet Area Peak BHP = 0.068 (RPM -1000)3 Tip Speed (fpm) = 3.46 x RPM CLASS III Consult Factory CHICAGO BLOWER CORPORATION CHICAGO BLOWER SINGLE WIDTH AIRFOIL 135 RA 13-7/32 In. Wheel Diameter 1.05 Sq. Ft. Outlet Area Peak BHP = 0.076 (RPM-1000)3 Tip Speed (fpm) = 3.46 x RPM CLASS I 3542 RPM CLASS II 4607 RPM CLASS III Consult Factory Performance shown is for installation type B - Free inlet, Ducted outlet. Power ratings (BHP) do not include drive losses.Performance ratings do not include the effects of appurtenances...

CHICAGO BLOWER SINGLE WIDTH AIRFOIL 14-9/16 In. Wheel Diameter 1.29 Sq. Ft. Outlet Area Peak BHP = 0.110 (RPM-1000)3 Tip Speed (fpm) = 3.81 x RPM CLASS I 3246 RPM CLASS II 4221 RPM CLASS III Consult Factory

CHICAGO BLOWER SINGLE WIDTH AIRFOIL 65 16-3/16 In. Wheel Diameter 1.57 Sq. Ft. Outlet Area Peak BHP = 0.187 (RPM -1000)3 Tip Speed (fpm) = 4.24 x RPM CLASS I 2886 RPM CLASS II 3753 RPM CLASS III 4721 RPM CHICAGO BLOWER CORPORATION CHICAGO BLOWER SINGLE WIDTH AIRFOIL 165 RA 16-3/16 In. Wheel Diameter 1.57 Sq. Ft. Outlet Area Peak BHP = 0.210 (RPM -1000)3 Tip Speed (fpm) = 4.24 x RPM CLASS I 2886 RPM CLASS II 3753 RPM CLASS III 4721 RPM Performance shown is for installation type B - Free inlet, Ducted outlet. Power ratings (BHP) do not include drive losses.Performance ratings do not include...

CLASS I 2653 RPM CLASS II 3437 RPM CLASS III 4323 RPM CHICAGO BLOWER SINGLE WIDTH AIRFOIL 17-13/16 In. Wheel Diameter 1.92 Sq. Ft. Outlet Area Peak BHP = 0.302 (RPM-1000)3 Tip Speed (fpm) = 4.66 x RPM

CHICAGO BLOWER CORPORATION CHICAGO BLOWER SINGLE WIDTH AIRFOIL 19-11/16 In. Wheel Diameter 2.30 Sq. Ft. Outlet Area Peak BHP = 0.499 (RPM-1000)3 Tip Speed (fpm) = 5.15 x RPM CLASS I 2355 RPM CLASS II 3063 RPM CLASS III 3853 RPM

CLASS I 2205 RPM CLASS II 2868 RPM CLASS III 3607 RPM CHICAGO BLOWER SINGLE WIDTH AIRFOIL 21-9/16 In. Wheel Diameter 2.85 Sq. Ft. Outlet Area Peak BHP = 0.786 (RPM-1000)3 Tip Speed (fpm) = 5.65 x RPM

CHICAGO BLOWER CORPORATION CHICAGO BLOWER SINGLE WIDTH AIRFOIL 24 In. Wheel Diameter 3.45 Sq. Ft. Outlet Area Peak BHP = 1.318 (RPM -1000)3 Tip Speed (fpm) = 6.28 x RPM CLASS I 1991 RPM CLASS II 2590 RPM CLASS III 3258 RPM

CLASS I 1809 RPM CLASS II 2353 RPM CLASS III 2959 RPM CHICAGO BLOWER SINGLE WIDTH AIRFOIL 26-7/16 In. Wheel Diameter 4.19 Sq. Ft. Outlet Area Peak BHP = 2.138 (RPM-1000)3 Tip Speed (fpm) = 6.92 x RPM

CHICAGO BLOWER CORPORATION CLASS I 1663 RPM CLASS II 2163 RPM CLASS III 2720 RPM CHICAGO BLOWER SINGLE WIDTH AIRFOIL 29-1/8 In. Wheel Diameter 5.17 Sq. Ft. Outlet Area Peak BHP = 3.469 (RPM-1000)3 Tip Speed (fpm) = 7.63 x RPM

CLASS I 1433 RPM CLASS II 1863 RPM CLASS III 2344 RPM CHICAGO BLOWER SINGLE WIDTH AIRFOIL 32-3/8 In. Wheel Diameter 6.26 Sq. Ft. Outlet Area Peak BHP = 6.183 (RPM-1000)3 Tip Speed (fpm) = 8.48 x RPM