27BI, Backward-Inclined Blowers 12 thru 27 BI

Performance certified is for Installation Type B - Free Inlet, Ducted Outlet.
Power rating (BHP) does not include transmission losses.
Performance ratings do not include the effects of appurtenances (accessories).

Specifications
Blower Specifications 27 Inch Wheel Diameter
Outlet Area (SQ. FT.) 4.260
Tip Speed (FPM) = 7.07 x RPM
Max. BHP = 3.982 x (RPM/1000)3
Performance Tables
Industrial Certification UL Certification


AMCA Certified Ratings


Central Blower Co. certified that the Backward Inclined Blowers shown here-in are licensed to bear the AMCA Seal. The 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.
Standard Features
Shaft Accurately machined from turned, ground and polished steel shafting.
Closely checked for diameter and straightness.
Frame Heavy gauge, galvanized steel, all welded construction provides rigid support for housing, motor, shaft and bearings.
Wheel Designed to efficiently force air through the blower housing with backward inclined blades set at the proper angle to prevent overloading of the motor. All sizes 12-BI through 36-BI are equipped with steel wheels as standard equipment and with aluminum wheels as optional equipment when AMCA type B spark resistant construction is specified. Sizes 9-BI and 10-BI are equipped with aluminum wheels as standard equipment. Wheels are dynamically balanced and are available in CW and CCW rotation.
Housing Constructed of heavy gauge steel. Available in eight discharge positions. When ordered from factory, blower will be assembled in discharge position specified.
Inlet Cone Spun steel construction, smoothly contoured to guide air into wheel with minimum turbulence. Unobstructed inlet to provide quiet operation.
Weather Cover Rust resistant galvanized steel construction protects the shaft, bearings, motor and drives from the weather. Also serves as a OSHA approved belt guard.
Bearings Self-aligning ball bearing pillow blocks are provided on all models.
Eccentric collars securely lock the inner race to the shaft. Pre-lubricated and sealed to retain lubricant and exclude dust and moisture, provide extended long life.
Motor Base Heavy gauge galvanized steel base, pivoted at one end and supported at the other by threaded rod for easy belt adjustment. Hinge type construction insures that the motor shaft will remain parallel with the blower shaft when adjusting belt tension.
Motors & Drives Standard motors are NEMA open-drip proof, available to match all requirements for H.P., RPM and electrical power. TEFC, 2-speed and explosion proof motors also available.

All Central BI blowers with motors up through 10 H.P. are equipped with adjustable pitch motor pulleys. 15 H.P. and larger are normally equipped with constant speed drives. V-Belts supplied are rated to transmit 150% of motor horsepower and are oil resistant and static dissipating. Factory installed motors and drives are carefully checked for smooth operation, and compliance with specifications for RPM and amperage.
Heat Slinger
Designed to prevent over-heating of bearing for blowers handling air at temperatures over 250°F. Consists of an aluminum disk mounted on the blower shaft between the blower housing and bearing to dissipate the heat from the shaft.
Drain Fitting 3/4" NPT coupling welded to low point of housing. Recommended where condensation or rain water might accumulate inside the housing. Plastic pipe plug supplied.
Disconnect Switch Available to match HP and power characteristics of the motor supplied
Vibration Isolators
Rubber In-Shear Pads: Available for units up to 18-BI size. Suitable only for non-critical applications.

Individual Spring Mounts: Provide approximately 1" vertical deflection. Designed for critical applications.

Spring Rails: Consists of spring isolators attached to rails to provide more even distribution of weight. Both individual or rail type provide seismic restraint.
Spark Resistant Construction Conforms to AMCA Type “B”. Requires non-ferrous wheel. AMCA Type “A” available. Consult factory.
Inlet & Outlet Flanges Available on special orders. Allow extra delivery time.
Acid Resistant Coatings Electrostatically applied epoxy recommended for most fume hood or similar applications. Other coatings are available for more extreme conditions.
Automatic Backdraft Dampers
Designed to prevent reverse flow of air when blower is not operating. Made to fit blower discharge. Also available with built-in bird screen.
Cleanout Door Provides access for cleaning or inspection of the interiors of the housing. Cover plate bolted with steel fasteners and fully gasketed.
Inlet & Outlet Screens
Prevent entrance of birds or debris and provide protection of personnel.
Warranty Central Blower Co. (the Company) warrants that each blower manufactured by the Company shall be free from defects in material and work man ship under normal use and service for a period of eighteen (18) months from the date of shipment or twelve (12) months from date of original installation, "whichever occurs first." If it appears within the warranty period that the blower does not meet the warranties specified above and the purchaser notifies the Company promptly, the Company agrees to remedy any such defect, at the Company’s option, either by repairing any defective parts or by furnishing at the Company’s factory a repair or re placement part.

This warranty shall not apply to any equipment which has been repaired or altered in any way so as, in the Company’s judgement, to affect its performance or reliability, nor which has been improperly installed or subject to misuse, negligence or accident. This warranty does not apply to electric motors, which however, carry warranty of the motor manufacturer. Warranty does not apply to drive belts. This warranty is expressed in lieu of all other warranties expressed or implied, and of all other obligations or liabilities on the Company’s part. The Company neither assumes, nor authorizes any representative or other persons to assume for it, any other liability in connection with the sale of its equipment.