BACKWARD INCLINED BI AND BIA INDUSTRIAL SWSI CENTRIFUGAL FANS

Transcription

1 BLLEIN 71-D November 2004 BACKWARD INCLINED BI AND BIA INDSRIAL SWSI CENRIFGAL FANS BI Flat Blade Design BIA Airfoil Blade Design Class I, II, III, IV

2 BI & BIA Industrial Centrifugal Fans Aerovent s BI and BIA Centrifugal Fans feature efficiently designed backward inclined wheels for industrial air moving applications. Designed for clean air applications, the BI and BIA fans offer energy savings and operate at lower noise levels than other industrial fan types. One of the most common uses for a BI fan is on the clean air side of a dust collector. An industrial fan is essential in a dust collector system. It induces the flow to move the contaminants through the system. A dust collector system can be designed with the fan upstream, clean air side, or downstream, dirty air side. For a particular application, each will have its advantages and disadvantages. If the system has the fan installed on the clean air side of the dust collector, where little or no dust is present, a more efficient fan can be selected. If the system has the fan installed on the dirty air side of the dust collector, a material handling fan must be selected. he BI fan can be installed on the clean air side of a dust collector system. his installation design will minimize blade erosion and reduce energy costs compared to installing a material handling fan on the dirty air side. A material handling fan emphasizes ruggedness and durability in its design, not efficiency, for heavy material loading. Due to continuous dust flow through the fan, the fan blades will eventually erode, requiring wheel replacement. A BI fan, however, emphasizes efficiency in its design, thus providing energy savings. By installing a BI fan on the clean air side of the dust collector, where little or no dust is present, blade erosion is also minimized, reducing maintenance costs. Note that although the BIA fan is more efficient, it should never be used in dust collecting systems. Features Welded steel with side angle reinforcement on housing Rotatable housing offered as standard for sizes 12" through 28" Class I, II, III, and IV construction Lifting eyes are provided on all sizes Wheel diameters from 12" through 7" Flow capacities to 215,000 CFM Static pressures to 20" w.g. emperature range from 40 F to 600 F* Available in Arrangements 1, 2, 3, 4, 7, 8,, and 10 *See page 6 for modifications at elevated temperatures Contents Features Wheel Design Accessories Performance Correction For emperature & Altitude. 6 Modifications Drive Arrangements & AMCA Motor Positions Engineering Data Performance Data BI BIA Dimensional Data ypical Specifications Certification Aerovent certifies that the BI and BIA SWSI Centrifugal Fans shown herein are licensed to bear the AMCA Seal. he 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 Aerovent Bulletin illustrations cover the general appearance of Aerovent products at the time of publication and we reserve the right to make changes in design and construction at any time without notice. 2 Aerovent Bulletin 71

3 Wheel Design BI Wheel BI wheels are furnished with flat heavy-gauge steel blades welded to front and back plates, providing a rugged, efficient fan for many industrial air moving applications. Aluminum and stainless steel construction are available for both fan housing and wheel. Aluminum construction is limited to a maximum temperature of 275 F. Wheel sizes 12" through 63" are equipped with malleable iron split-taper bushings. All larger diameter wheels are furnished with straight bore hubs. BIA Wheel he BIA wheel features a backward curve airfoil blade design. his wheel offers the same power limiting characteristics of the BI wheel, but has the added advantage of higher operating efficiencies and lower noise levels. his wheel is limited primarily to clean air applications. Wheel sizes 12" through 25" are furnished in welded aluminum construction. All other sizes are furnished in steel construction as standard, aluminum as an option. WR 2 Factors (moment of inertia in lb-ft 2 ) BI WHEELS BIA WHEELS SIZE CLASS I CLASS II CLASS III CLASS IV CLASS I CLASS II CLASS III CLASS IV (IN.) ALM SEEL ALM SEEL ALM SEEL ALM SEEL ALM SEEL ALM SEEL ALM SEEL ALM SEEL Aerovent Bulletin 71 3

4 Accessories Safety Equipment OSHA YPE BEL GARD Complete coverage of belts and sheaves to provide maximum protection for personnel. Includes a tachometer opening for checking the fan speed. On Arrangement fans belt and shaft guards are bolted to the fan base for easy removal. SHAF & BEARING GARD Solid sheet metal enclosure designed to cover the shaft and bearings. Grease lines are accessible for lubrication purposes. INLE GARD A spiral wire type safety guard is offered as an accessory for attachment to the fan inlet when no duct connection is used. Vibration Isolators Rubber-in-shear or spring type vibration isolators are available for all sizes and arrangements. Flanged Inlet and Outlet For bolted duct connections, flanges can be provided on both the inlet and the outlet. Flanges are predrilled. Companion flanges are also available. Shaft Seal Four types of friction shaft seals are available: 1. Elastomeric Rotary Seal Rides against a heavy eflon wear plate. Spare seal provided as standard. his seal is suitable for operation to 300 F. 2. Ceramic Felt Elements are encased between housing drive side and metal retaining plate. Ceramic felt inserts may be easily split for field installation and maintenance. he seal is best suited for 301 F to 600 F operation. hese seals minimize leakage around the shaft opening but are not gas-tight. 3. Lubricated Seals For longer seal life. Suitable to 300 F. 4. Stuffing Boxes hree rows of permanently lubricated packing material encased between housing drive side and machined metal packing gland. he shaft seal provides the best seal against gas leakage, but is not totally gas-tight. Suitable for operation to 500 F. Cleanout Doors Cleanout doors are available in two types: 1. Quick opening, latch type and neoprene foam gasketed. 2. Bolted type, gasketed. Doors are located at approximately 3 o clock or o clock positions on housing scroll opposite fan discharge. If specific location is required, provide detailed information. Housing Drain A standard 1" drain, female thread less plug, is welded to the housing at the lowest point. Hinged Cleanout Door Bolted Cleanout Door 4 Aerovent Bulletin 71

5 Accessories Split Housing YPE A Available with bottom horizontal, upblast, downblast and top angular up discharge positions. Horizontal split allows removal of top section without disturbing inlet connection. Outlet connection must be broken on upblast and top angular up fans only. YPE B Available with top horizontal, top angular down and bottom angular up discharge positions. ype B split allows removal of pie-shaped section without disturbing inlet or outlet connections. ype A ype B nitary Bases nitary bases are offered in all sizes as an option. Bases are constructed of structural channel in the following sizes: 12" through 22" " channel 25" through 32" " channel 35" and 3" " channel 44" through 55" " channel 63" through 7" " channel Outlet Dampers Parallel Blade Has lowest first cost and is best suited to applications requiring accurate air volume control from wide open to 75% of wide open. Opposed Blade his damper is slightly higher in first cost than the parallel blade type. It is best suited for control over a broad range of air volume. Standard Duty Static pressure to 7" w.g. and 300 F, available to 600 F. Heavy-Duty Recommended for severe duty applications or where continual modulation is required. Static pressure to 14" w.g. and 300 F, available to 600 F. BI and BIA Swingout Option Available in sizes 25" through 4", the swingout option permits quick access to the fan interior, allowing for easy cleaning of the wheel and housing without disturbing the connecting ductwork. Inlet Vane Damper Nested or external type inlet vane dampers are offered for control of air volume while reducing horsepower. External Inlet Vanes Aerovent Bulletin 71 5

6 Performance Correction For emperature & Altitude Fan Calculations For Elevated emperatures at Sea Level When a fan operates at standard conditions, it is handling air at 70 F as measured at sea level. If the performance of the fan is based on standard conditions, the fan can be selected directly from the performance tables in this catalog. When a fan operates at temperatures other than 70 F, a temperature correction factor is utilized to convert the operating conditions to standard conditions. his conversion must be done before the fan can be selected from the performance tables in this catalog. After the fan is selected at standard conditions, the temperature correction factor is utilized again to convert the standard brake horsepower to the operating brake horsepower. his is shown in the example below. he temperature correction factors are found in able 1. Example: he contractor specifies a 20" centrifugal fan with a BI wheel, in Arrangement 1, to provide 6,660 CFM at 3 1 2" SP, at 600 F ( lbs./cu. ft. density) at sea level. For 600 F, able 1 shows a temperature correction factor of sing the temperature correction factor, the static pressure at standard conditions is determined as follows: Operating x emp. Correction Static Pressure Static Pressure Factor = at Std. Conditions 3 1 2" SP x 2.00 = 7" SP at Standard Conditions urn to page 14 for the 20" BI fan performance table. sing 6,660 CFM at 7" SP at standard conditions, find the RPM and brake horsepower to be 2404 RPM and 10.3 BHP. Note: 10.3 BHP is the brake horsepower required at standard conditions and is also referred to as the cold brake horsepower or starting brake horsepower. he actual brake horsepower at the operating condition of 600 F and sea level is determined by the following equation: Brake HP at Std. Conditions Brake HP at Correction Factor = Operating Conditions 10.3 = 5.47 BHP at Operating Conditions 2.00 herefore, the 20" BI fan providing 6,660 CFM at 3 1 2" SP, at 600 F will run at 2404 RPM and will require 5.47 BHP at operating conditions and 10.3 BHP at starting. When operating at temperatures other than 70 F, the maximum speed of the fan class is affected. o determine the maximum speed at the operating temperature a maximum safe speed factor is applied to the maximum speed of the class. able 2 shows the maximum safe speeds for BI wheels at 70 F and able 3 shows the maximum safe speed factors for elevated temperatures. For this example, assuming steel construction, the maximum safe speed factor is 0.2. a. he maximum Class I RPM is 141 RPM. In this example the operating RPM, 2404 RPM, is greater than 141 RPM. A Class I fan cannot be utilized. b. he maximum Class II RPM is 2523 RPM. Applying the maximum safe speed factor: 2523 RPM x 0.2 = 2321 RPM For this example, the operating RPM, 2404 RPM, is greater than 2321 RPM. herefore, a Class II fan cannot be utilized. c. he maximum Class III RPM is 3202 RPM. Applying the maximum safe speed factor: 3202 RPM x 0.2 = 246 RPM Since 246 RPM is greater than the operating speed of 2404 RPM, a Class III, 20" BI fan can be utilized. able 1. emperature Correction Factors ( F) EMP. ( F) FACOR EMP. ( F) FACOR able 2. Maximum Safe Speeds For BI Wheels at 70 F emperature (Mild Steel) SIZE CLASS I CLASS II CLASS III CLASS IV (IN.) BI BIA BI BIA BI BIA BI BIA able 3. Maximum Safe Speed Factors For Alloy Wheel Construction at Elevated emperatures MAERIAL Steel Aluminum Stainless Steel Stainless Steel Stainless Steel Aerovent Bulletin 71

7 Performance Correction for emperature & Altitude Fan Calculations For Altitudes Other han Sea Level at 70 F When a fan operates at 70 F but at an altitude other than sea level, an Altitude Correction Factor is utilized to convert these conditions to standard conditions. he conversion must be done before the fan can be selected from the performance tables in this catalog. After the fan is selected at standard conditions, the altitude correction factor is utilized to convert the standard brake horsepower to the operating brake horsepower. his method for correcting altitude is the same as for temperature except the altitude correction factors are found in able 4. able 4. Altitude Correction Factors (Feet Above Sea Level) ALIDE FACOR ALIDE FACOR , , , , , , , , , , , , , , , , , , Fan Calculations For emperatures Other than 70 F and Altitudes Other than Sea Level When a fan operates at temperatures other than 70 F and altitudes other than sea level, the correction factors for both temperature and altitude must be applied. his conversion must be done before the fan can be selected from the performance tables in this catalog. After the fan is selected at standard conditions, the temperature and altitude correction factor is utilized to convert the standard brake horsepower to the operating brake horsepower. he emperature And Altitude Correction Factor is calculated as follows: emp. Altitude emp. & Altitude = Correction x Correction Correction Factor Factor Factor (able 1) (able 4) For example, if the operating conditions are 450 F and 3000 feet above sea level, the correction factor is determined as follows: a. From able 1, the temperature correction factor for 450 F is b. From able 4, the altitude correction factor for 3000 feet above sea level is c. herefore, 1.72 x 1.12 = 1.3 For 450 F and 3000 feet above sea level, the emperature & Altitude Correction Factor is 1.3. able 5. Velocity Pressures vs. Fan Outlet Velocities Based on Standard Air VELOCIY VELOCIY VELOCIY VELOCIY PRESSRE PRESSRE (FPM) (FPM) (IN. H2O) (IN. H2O) 1, , , , , , , , , , , , , , , , , , , , , , , , , able 6. Metric Conversion Factors ENGLISH FACOR MERIC VOL. FLOW CFM m 3 /s PRESSRE SP kpa POWER BHP kw VELOCIY FPM m/s DENSIY lb/ft kg/m 3 SPEED RPM rps AREA ft m 2 CIRCMFERENCE ft m DIAMEER in mm Aerovent Bulletin 71 7

8 Modifications Heat Fans All BI fans (sizes 12" to 7") and BIA fans (sizes 25" to 7") can be used for operation at elevated temperatures provided certain modifications are made. he effect of various temperatures on material strength must also be considered. Maximum temperatures for each arrangement and fan modifications to meet these temperatures are given in able 7. Safe speed limits at various temperatures for each fan size are listed in able 2 and able 3 on page 6. able 7. Maximum emperatures and Modifications ARRG. MAX. EMP. NO. SANDARD MODIFIED MODIFICAIONS 1 & Heat slinger and guard Heat slinger, slinger guard and motor heat shield Heat slinger, slinger guard and motor heat shield & able 8. Arrangements and Maximum emperatures ARRANGEMEN AND MAX. EMPERARES SIZE 1 2 ➀ (IN.) 600 F 275 F 200 F 180 F 200 F 600 F 600 F 600 F 12 ➁ X X X X X X 14 ➁ X X X X X X 16 ➁ X X X X X X 18 ➁ X X X X X X 20 ➁ X X X X X X 22 ➁ X X X X X X 25 X X X X X X 28 X X X X X X X 32 X X X X X X X 35 X X X X X X 3 X X X X X X 44 X X X X X 4 X X X X X 55 X X X X X 63 X X X X X 71 X X X X X 7 X X X X X ➀ Class I and II. ➁ Maximum temperature 275 F on BIA fan arrangements 1, 8, and 10. Corrosion Resistance Corrosion problems result when the air contains one or more chemicals which are corrosive in nature. he extent of the corrosion problem, however, varies with the specific properties of the chemical involved, the concentration, moisture content, and temperature of the mixture. Protective coatings and special construction are available to combat corrosion problems. Spark-Resistant Construction Described below are three classifications as defined by AMCA Standards for spark resistant construction. ype A B C Construction Details All parts of the fan in contact with the air or gas being handled shall be made of nonferrous material. Steps must also be taken to ensure that the wheel, bearings, and shaft are adequately attached and/or restrained to prevent a lateral or axial shift in these components. he fan shall have a nonferrous wheel and nonferrous ring about the opening through which the shaft passes. Ferrous hubs, shafts, and hardware are allowed provided construction is such that a shift of wheel or shaft will not permit two ferrous parts of the fan to rub or strike. Steps must also be taken to ensure that the wheel, bearings, and shaft are adequately attached and/or restrained to prevent a lateral or axial shift in these components. he fan shall be so constructed that a shift of the wheel or shaft will not permit two ferrous parts of the fan to rub or strike. NOES: 1. No bearings, drive components or electrical devices shall be placed in the air or a gas stream unless they are constructed or enclosed in such a manner that failure of that component cannot ignite the surrounding gas stream. 2. he user shall electrically ground all fan parts. 3. For this standard, nonferrous material shall be any material with less than 5% iron or any other material with demonstrated ability to be spark resistant. 4. he use of aluminum or aluminum alloys in the presence of steel, that have been allowed to rust, requires special consideration. Research by the.s. Bureau of Mines and others has shown that aluminum wheels rubbing on rust steel may cause high intensity sparking. he use of the above standard in no way implies a guarantee of safety for any level of spark resistance. Spark resistant construction also does not protect against ignition of explosive gases caused by catastrophic failure or from any airstream material that may be present in a system. 8 Aerovent Bulletin 71

9 Drive Arrangements & AMCA Motor Positions Belt Driven Arrangements ARRANGEMEN 1 has a shaft and bearing assembly designed to be driven by a separately mounted motor. hese fans are available throughout the range of sizes. he fan can be modified for operation at elevated temperatures to a maximum of 600 F.* ARRANGEMEN 2 has the wheel overhung with a compact bearing and shaft assembly for belt driven or direct connection. Available in Class I and Class II construction for sizes 12" through 25". emperature to 275 F. ARRANGEMEN 3 For maximum structural strength, bearings are mounted on each side of the wheel. Available in sizes 28" through 7". hese units are limited to handling dry uncontaminated air to 200 F maximum. se Arrangement 2 for fans smaller than size 28". ARRANGEMEN V-belt drive with the motor mounted on the bearing base support. A slide rail base under the motor provides for easy adjustment of the belt tension. It is located on the right side as standard (when viewed from the drive end of the shaft). he fan can be modified for operation at elevated temperatures to a maximum of 600 F. ARRANGEMEN 10 is available in sizes 12" through 3". he motor is mounted directly under the fan shaft on a base so that the belt tension can be adjusted by means of a slide rail base. his fan can be modified for elevated temperatures to a maximum of 600 F.* *See page 8 for modifications at elevated temperatures. Direct Drive Arrangements he direct drive assemblies described below are available for applications requiring minimum maintenance, where exact design conditions have been established, and where the motor size is within practical limits. When the desired fan performance is not obtainable with the standard fan, optional narrow width construction is available to meet the specific requirements. ARRANGEMEN 4 Direct drive assembly with the wheel mounted directly to the motor shaft. Compact and easy to maintain design for applications where exact conditions are established. Available as standard in sizes 12" through 32". For sizes larger than 32" please consult the factory. Maximum temperature is 180 F. ARRANGEMEN 7 his is an Arrangement 3 fan with a pedestal added to accommodate a motor and flexible coupling. Available in sizes 28" through 7". hese units are limited to handling dry uncontaminated air to 200 F maximum. ARRANGEMEN 8 Same as Arrangement 1 fan but with an extended pedestal to accommodate a motor and flexible coupling. hese fans are available throughout the range of sizes. he fan can be modified for operation at elevated temperatures to a maximum of 600 F.* AMCA Motor Positions NOE: For Arrangement 1 and 3, specify AMCA motor position and the following when ordering: (1) V-belt drive, (2) vibration bases, (3) belt guards. Motor positions are determined by viewing fan from drive side and selecting W, X, Y or Z. Reprinted from AMCA Publication with the express written permission from the Air Movement and Control Association International, Inc., 30 West niversity Drive, Arlington Heights, IL Aerovent Bulletin 71

10 Engineering Data Material Specifications Class I, II, III HOSING BI WHEEL ➀ SHAF DIA. (IN.) BI BIA SCROLL FRAME WHEEL WHEEL SIZE INLE DISCH. BACK FRON ARRG. ARRG. ANGLE BLADE REINF. WEIGH WEIGH BACK SIDE FLANGE FLANGE PLAE PLAE SIZE (LB) (LB) CLASS I /2x1 1 /2x 1 /8 1 1 /2x 3 /16 1x 1 / /2x1 1 /2x 1 /8 1 1 /2x 3 /16 1x 1 / / / /2x1 1 /2x 1 /8 1 1 /2x 3 /16 1x 1 / / / /2x1 1 /2x 1 /8 1 1 /2x 3 /16 1x 1 / / / /2x1 1 /2x 3 / /2x 3 / /2x 3 / /2 1 1 / /2x1 1 /2x 3 / /2x 3 / /2x 3 / / / x2x 3 / /2x 3 / /2x 3 / / / x2x 1 /4 1 1 /2x 3 / /2x 3 / / / x2x 1 /4 2x 1 /4 1 1 /2x 3 / / / x2x 1 /4 2x 1 /4 2x 1 / / / x2x 1 /4 2x 1 /4 2x 1 / / / /2x2 1 /2x 1 /4 2x 1 /4 2x 1 / / / /2x2 1 /2x 1 /4 2x 1 /4 2x 1 / /16 ➁ 2 7 / x3x 1 /4 2x 1 /4 2x 1 / /16 ➁ 2 7 / x3x 1 /4 2x 1 /4 2x 1 / /16 ➁ 2 11 /16 ➁ x4x 1 /4 3x 5 /16 2x 1 / /16 ➁ 2 15 /16 ➁ x4x 1 /4 3x 5 /16 2x 1 / /16 ➁ 3 7 /16 ➁ CLASS II /2x1 1 /2x 1 /8 1 1 /2x 3 /16 1x 1 / / /2x1 1 /2x 1 /8 1 1 /2x 3 /16 1x 1 / / / /2x1 1 /2x 1 /8 1 1 /2x 3 /16 1x 1 / / / /2x1 1 /2x 1 /8 1 1 /2x 3 /16 1x 1 / /2 1 1 / /2x1 1 /2x 3 / /2x 3 / /2x 3 / /2 1 1 / /2x1 1 /2x 3 / /2x 3 / /2x 3 / / / x2x 3 / /2x 3 / /2x 3 / /16 ➁ 1 15 / x2x 1 /4 1 1 /2x 3 / /2x 3 / /16 ➁ 1 11 / x2x 1 /4 2x 1 /4 1 1 /2x 3 / /16 ➁ 1 15 / x2x 1 /4 2x 1 /4 2x 1 / /16 ➁ 2 3 / x2x 3 /8 2x 1 /4 2x 1 / /16 ➁ 2 7 / /2x2 1 /2x 3 /8 2x 1 /4 2x 1 / /16 ➁ 2 11 /16 ➁ /2x2 1 /2x 3 /8 2x 1 /4 2x 1 / /16 ➁ 2 11 /16 ➁ x3x 3 /8 2x 1 /4 2x 1 / /16 ➁ 2 15 /16 ➁ x3x 3 /8 2x 1 /4 2x 1 / /16 ➁ 3 7 /16 ➁ x4x 3 /8 3x 5 /16 2x 1 / /16 ➁ 3 7 /16 ➁ x4x 3 /8 3x 5 /16 2x 1 / /16 ➁ 3 15 /16 ➁ CLASS III /2x1 1 /2x 3 / /2x 3 /16 1x 1 / / /2x1 1 /2x 3 / /2x 3 /16 1x 1 / / /2x1 1 /2x 3 / /2x 3 /16 1x 1 / / /2x1 1 /2x 3 / /2x 3 /16 1x 1 / /16 ➁ /2x1 1 /2x 3 / /2x 3 / /2x 3 / /16 ➁ /2x1 1 /2x 3 / /2x 3 / /2x 3 / /16 ➁ x2x 3 / /2x 3 / /2x 3 / /16 ➁ x2x 1 /4 1 1 /2x 3 / /2x 3 / /16 ➁ 1 15 /16 ➁ x2x 1 /4 2x 1 /4 1 1 /2x 3 / /16 ➁ 2 3 /16 ➁ x2x 1 /4 2x 1 /4 2x 1 / /16 ➁ 2 7 /16 ➁ x2x 3 /8 2x 1 /4 2x 1 / /16 ➁ 2 11 /16 ➁ /2x2 1 /2x 3 /8 2x 1 /4 2x 1 / /16 ➁ 2 15 /16 ➁ /2x2 1 /2x 3 /8 2x 1 /4 2x 1 / /16 ➁ 2 15 /16 ➁ x3x 3 /8 2x 1 /4 2x 1 / /16 ➁ 3 7 /16 ➁ x3x 3 /8 2x 1 /4 2x 1 / /16 ➁ 3 15 /16 ➁ x4x 3 /8 3x 5 /16 2x 1 / /16 ➁ 4 7 /16 ➁ x4x 3 /8 3x 5 /16 2x 1 / /16 ➁ 4 7 /16 ➁ ➀ BIA wheels utilize same front and backplate with airfoil constructed blades. ➁ Spherical roller bearings. All dimensions in inches except where noted. 10 Aerovent Bulletin 71

11 Engineering Data Material Specifications Class IV HOSING BI WHEEL ➀ SHAF DIA. (IN.) BI BIA SCROLL FRAME WHEEL WHEEL SIZE INLE DISCH. BACK FRON ARRG. ARRG. ANGLE BLADE REINF. WEIGH WEIGH BACK SIDE FLANGE FLANGE PLAE PLAE SIZE (LB) (LB) CLASS IV /2x1 1 /2x 3 / /2x 1 /8 1 1 /2x 3 /16 10 ga. 12 ga. 12 ga. 12 ga. 1 7 / /2x1 1 /2x 3 / /2x 1 /8 1 1 /2x 3 /16 10 ga. 12 ga. 12 ga. 12 ga. 1 1 / /2x1 1 /2x 3 / /2x 1 /8 1 1 /2x 3 /16 10 ga. 12 ga. 12 ga. 12 ga. 1 1 / /2x1 1 /2x 3 / /2x 1 /8 1 1 /2x 3 /16 10 ga. 12 ga. 12 ga. 12 ga /16 ➁ /2x1 1 /2x 3 / /2x 1 /8 1 1 /2x 3 /16 7 ga. 12 ga. 12 ga. 12 ga /16 ➁ /2x1 1 /2x 3 / /2x 1 /8 1 1 /2x 3 /16 7 ga. 12 ga. 10 ga. 10 ga /16 ➁ x2x 3 / /2x 3 / /2x 3 /16 7 ga. 10 ga. 10 ga. 10 ga /16 ➁ x2x 1 /4 1 1 /2x 3 / /2x 3 /16 7 ga. 10 ga. 7 ga. 7 ga. 2 3 /16 ➁ 1 15 /16 ➁ x2x 1 /4 2x 3 / /2x 3 /16 7 ga. 10 ga. 7 ga. 7 ga. 2 7 /16 ➁ 2 3 /16 ➁ x2x 1 /4 2x 3 /16 2x 3 /16 1 /4" 10 ga. 7 ga. 7 ga /16 ➁ 2 7 /16 ➁ x2x 3 /8 2x 3 /16 2x 3 /16 1 /4" 10 ga. 1 /4" 1 /4" 2 15 /16 ➁ 2 11 /16 ➁ /2x2 1 /2x 3 /8 2x 1 /4 2x 3 /16 1 /4" 10 ga. 1 /4" 1 /4" 3 7 /16 ➁ 2 15 /16 ➁ /2x2 1 /2x 3 /8 2x 1 /4 2x 3 /16 3 /8" 7 ga. 1 /4" 1 /4" 3 7 /16 ➁ 2 15 /16 ➁ x3x 3 /8 2x 1 /4 2x 3 /16 3 /8" 7 ga. 1 /4" 1 /4" 3 15 /16 ➁ 3 7 /16 ➁ x3x 3 /8 2x 1 /4 2x 3 /16 3 /8" 7 ga. 1 /4" 1 /4" 4 7 /16 ➁ 3 15 /16 ➁ x4x 3 /8 2x 1 /4 2x 3 /16 3 /8" 1 /4" 1 /4" 1 /4" 4 15 /16 ➁ 4 7 /16 ➁ x4x 3 /8 2x 1 /4 2x 3 /16 3 /8" 1 /4" 1 /4" 1 /4" 5 7 /16 ➁ 4 7 /16 ➁ ➀ BIA wheels utilize same front and backplate with airfoil constructed blades. ➁ Spherical roller bearings. All dimensions in inches except where noted. Approximate Shipping Weights (lb) CLASS I CLASS II CLASS III CLASS IV FAN ARRANGEMEN ARRANGEMEN ARRANGEMEN ARRANGEMEN SIZE NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA Other arrangement weights available on request. Aerovent Bulletin 71 11

12 BI - Flat Blade Capacities shown in the performance tables that follow are for standard air conditions: 70 F at sea level (0.075 lbs./cu. ft. air density). For temperature or altitude other than standard, correct for air density (see pages 6 and 7). Safe operating speed limits for various temperature conditions and maximum safe speed factors for alloy wheel construction are shown on page 6. Size 12" he performance tables shown are given in English units. o convert these figures to metric units, multiply the English unit by the conversion factor found in the table on page 7. WHEEL DIAMEER = in. OLE AREA = 0.88 ft 2 WHEEL CIRCMFERENCE = 3.25 ft. MAX. BHP = (RPM 1000) MAXIMM RPM: Class I 3080 Class II 4005 Class III 5083 Class IV 6318 Size 14" WHEEL DIAMEER = 13.8 in. OLE AREA = 1.12 ft 2 WHEEL CIRCMFERENCE = 3.66 ft. MAX. BHP = (RPM 1000) MAXIMM RPM: Class I 2732 Class II 3554 Class III 4511 Class IV 5604 Performance shown is for installation ype D: Ducted inlet, ducted outlet. 12 Aerovent Bulletin 71

13 BI - Flat Blade Size 16" WHEEL DIAMEER = in. OLE AREA = 1.42 ft 2 WHEEL CIRCMFERENCE = 4.12 ft. MAX. BHP = 0.26 (RPM 1000) MAXIMM RPM: Class I 2425 Class II 3153 Class III 4002 Class IV 474 Size 18" WHEEL DIAMEER = in. OLE AREA = 1.80 ft 2 WHEEL CIRCMFERENCE = 4.64 ft. MAX. BHP = 0.46 (RPM 1000) MAXIMM RPM: Class I 2156 Class II 2802 Class III 3557 Class IV 4421 Performance shown is for installation ype D: Ducted inlet, ducted outlet. Aerovent Bulletin 71 13

14 BI - Flat Blade Size 20" WHEEL DIAMEER = 1.66 in. OLE AREA = 2.22 ft 2 WHEEL CIRCMFERENCE = 5.15 ft. MAX. BHP = 0.78 (RPM 1000) MAXIMM RPM: Class I 141 Class II 2523 Class III 3202 Class IV 381 Size 22" WHEEL DIAMEER = in. OLE AREA = 2.7 ft 2 WHEEL CIRCMFERENCE = 5.77 ft. MAX. BHP = 1.40 (RPM 1000) MAXIMM RPM: Class I 1732 Class II 2252 Class III 2858 Class IV 3553 Performance shown is for installation ype D: Ducted inlet, ducted outlet. 14 Aerovent Bulletin 71

15 BI - Flat Blade Size 25" WHEEL DIAMEER = in. OLE AREA = 3.53 ft 2 WHEEL CIRCMFERENCE = 6.4 ft. MAX. BHP = 2.57 (RPM 1000) MAXIMM RPM: Class I 1540 Class II 2002 Class III 2541 Class IV 315 Size 28" WHEEL DIAMEER = 27.5 in. OLE AREA = 4.4 ft 2 WHEEL CIRCMFERENCE = 7.32 ft. MAX. BHP = 4.60 (RPM 1000) MAXIMM RPM: Class I 1367 Class II 1777 Class III 2255 Class IV 2803 Performance shown is for installation ype D: Ducted inlet, ducted outlet. Aerovent Bulletin 71 15

16 BI - Flat Blade Size 32" WHEEL DIAMEER = in. OLE AREA = 5.70 ft 2 WHEEL CIRCMFERENCE = 8.25 ft. MAX. BHP = 8.3 (RPM 1000) MAXIMM RPM: Class I 1213 Class II 1576 Class III 2000 Class IV 2487 Size 35" WHEEL DIAMEER = in. OLE AREA = 7.21 ft 2 WHEEL CIRCMFERENCE =.28 ft. MAX. BHP = (RPM 1000) MAXIMM RPM: Class I 1078 Class II 1402 Class III 177 Class IV 2211 Performance shown is for installation ype D: Ducted inlet, ducted outlet. 16 Aerovent Bulletin 71