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- DFOS-103
DFOS-103
DFOS-103
The document details the specifications and features of Chicago Blower Corporation's Design 51 single-width airfoil fans, known for their efficiency and reliability in clean air applications. These fans are suitable for industrial supply or exhaust systems and come in various sizes and configurations to meet diverse installation needs.
Design 51 fans range in size from 135 to 890, with pressure capabilities up to 20" WG and volumes up to 220,000 CFM. Constructed with heavy gauge steel and welded for durability, they comply with AMCA standards for operating limits and maximum wheel diameters.
The airfoil wheel design offers high efficiency and a broad operating range, ideal for variable air volume systems. The fans maintain stable airflow and pressure with minimal volume changes, and precision balancing ensures quiet, vibration-free operation.
The fans feature rugged wheels and housings with continuously welded steel and rigid bearing bases. Precision shafts are made from high-quality SAE 1040-1045 steel, and the bearings are designed for long life.
The Inlet Volume Control (IVC) allows precise air control. Accessories such as flanged inlets/outlets, inlet screens, and shaft seals enhance functionality. Options for spark-resistant construction and special coatings are available for specific applications.
Features include unitary bases, shaft and bearing guards, belt guards, access doors, and extended grease fittings. Split housings facilitate wheel removal, and spark-resistant construction is available for certain conditions.
Tables for temperature and altitude correction factors and maximum RPM limits for different fan classes are included. An example calculation demonstrates fan selection for specific conditions, considering temperature and altitude.
The RA Design 51 series is highlighted as an alternative for lower pressure applications, offering improved efficiency and lower sound levels. A comparison example illustrates performance differences between the standard and RA designs.
General
The document outlines specifications for a high-performance, low-maintenance centrifugal fan with an airfoil wheel and hyperbolic wheel cone, tested according to AMCA standards for air and sound performance. Manufactured in the USA, Chicago Blower Corporation is an acceptable vendor.
The fan features steep pressure and non-overloading horsepower characteristics, with mechanical efficiency not less than 80%. The wheel inlet cone is designed for smooth, stable airflow across the operating range.
The fan housing and base are constructed from welded, heavy gauge materials with seven common discharge positions. The scroll is continuously welded to be air-tight, and housing stiffeners and the base are welded constructions.
The wheel has a cast iron hub lock-bolted to a heavy backplate, with blades welded to the backplate and hyperbolic wheel cone. Wheels are dynamically balanced to G 6.3 standards per ISO 1940 and ANSI S2.19 specifications.
The housing assembly includes integral mounting angles for foundation connection. An adjustable motor base is welded to the base as an accessory.
Motors and drives are factory mounted, and the unit is tested at running speed for vibration and balance. Filtered vibration readings at bearings should not exceed .15 inches per second.
The inlet volume control (IVC) device is enclosed within the inlet cone, featuring a 7-bladed design to control volume and pressure smoothly without fluttering.
Various accessories are listed, including slip fit inlet, flanged inlet or outlet, spark-resistant construction, housing drain, shaft seal, access doors, inlet screen, shaft cooling wheel, adjustable motor base, shaft and bearing guard, belt guard, V-belt drives, outlet damper, and unitary base.
The document is related to the Design 51 Single Width centrifugal airfoil fans by Chicago Blower Corporation, printed in May 2011.
Catalog excerpts
Bulletin DFOS 103 DESIGN 51 Bulletin DFOS 103 DESIGN 51 SINGLE WIDTH AIRFOIL FANS AN ISO 9001 COMPANY CHICAGO BLOWER CORPORATION
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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...
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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...
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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...
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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...
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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...
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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...
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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
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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...
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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
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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
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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
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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
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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
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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
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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
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