CBA Direct Drive Centrifugal Blower
Engineered industrial direct-drive centrifugal blowers featuring backward-curved single impellers, direct motor coupling, and 16 verified 60Hz operating configurations delivering up to 19,417 CFM and 17.0 in. static pressure (4,250 Pa) across Saudi Arabia.
Engineering & Application Overview: CBA Direct Drive Blower
The CBA-BA series consists of industrial direct-drive centrifugal blowers manufactured by United Electrical Supplies Factory Co., engineered for higher-pressure clean-air ventilation, process air boosting, and equipment exhaust where system static resistance exceeds the capacity of standard axial or utility blowers (operating at static pressures up to 17.0 in. SP / 4,250 Pa). Suffix -A designates direct-drive mode, where the backward-curved single-inlet (BS) impeller mounts directly onto the motor shaft supported by a heavy-duty rear bracket. Operating data covers 16 distinct 60Hz configurations across 10 sizes from CBA03(250 mm, 1 HP) to CBA28(710 mm, 25 HP). Note: Each intermediate size (315 to 450 mm) features distinct High-Speed (3420 RPM, 380V) and Low-Speed (1720 RPM, 220V) motors; project selection must match your calculated duct static friction. Standard CBA-BA blowers are clean-air rated; corrosive chemical fumes, explosive atmospheres, and hot gas emissions require separately certified engineered configurations.
Understanding the CBA model code & drive configurations
Catalogue designation CBA - BA - XXX BS - A - A - S specifies exact casing, inlet diameter, impeller style, drive arrangement, motor bracket, and material.
Industrial Centrifugal Fan Series
-BA: Traditional Direct-Drive Fan; -PK: Embedded Fan; -K: Insulated Casing
250, 280, 315, 355, 400, 450, 500, 560, 630, or 710 mm spigot
BS: Backward curved, Single inlet wheel (high efficiency, non-overloading)
-A: Direct Drive (motor directly coupled); -C: Belt Drive (with bearing pedestal)
Heavy support bracket mounting style (-N, -A, -B, -K, -R, -T)
-Q: Carbon Steel with black powder coating; -S: Stainless Steel (silver finish)
Standard 6-Position Air Outlet Discharge Orientation:
CBA scroll casings are factory-configured for either Clockwise (Right: RD 0° bottom horizontal, RS 90° upblast side, RU 180° top horizontal) or Counter-Clockwise (Left: LD 0° bottom horizontal, LS 90° upblast side, LU 180° top horizontal). Discharge orientation must be indicated during procurement to align with physical duct risers.
CBA direct drive centrifugal blower 16 verified configurations
Extracted from official manufacturer 60Hz catalogue performance pages (p. 4–8). Intermediate models (315 to 450 mm) are split into distinct High-Speed (3420 RPM, 380V) and Low-Speed (1720 RPM, 220V) rows to prevent invalid hybrid configurations. Sizing must match your calculated duct static resistance.
| Model Designation | Inlet Size | Speed (RPM) | Power (HP) | Voltage (60Hz) | Operating CFM Range | Static Pressure (SP) | Total Pressure (TP) | Drive Style |
|---|---|---|---|---|---|---|---|---|
| CBA-BA-250BS-A-B-Q (CBA03) | 250 mm (10") | 3420 | 1.0 HP | 380V 3-Phase | 665 – 1,480 CFM | 2.0" – 5.1" SP | 2.9" – 5.2" TP | Direct (-A) |
| CBA-BA-280BS-A-B-Q (CBA05) | 280 mm (11") | 3420 | 2.0 HP | 380V 3-Phase | 389 – 2,965 CFM | 0.1" – 9.4" SP | 2.3" – 9.4" TP | Direct (-A) |
| CBA-BA-315BS-A-B-Q (High Speed) | 315 mm (12.5") | 3420 | 4.0 HP | 380V 3-Phase | 1,496 – 2,824 CFM | 3.6" – 7.4" SP | 5.1" – 8.5" TP | Direct (-A) |
| CBA-BA-315BS-A-B-Q (Low Speed) | 315 mm (12.5") | 1720 | 0.5 HP | 220V 1/3-Phase | 748 – 1,412 CFM | 1.0" – 2.0" SP | 1.3" – 2.1" TP | Direct (-A) |
| CBA-BA-355BS-A-B-Q (High Speed) | 355 mm (14") | 3420 | 5.5 HP | 380V 3-Phase | 2,061 – 4,738 CFM | 2.7" – 10.0" SP | 4.3" – 10.3" TP | Direct (-A) |
| CBA-BA-355BS-A-B-Q (Low Speed) | 355 mm (14") | 1720 | 0.75 HP | 220V 1/3-Phase | 1,031 – 2,369 CFM | 0.7" – 2.5" SP | 1.1" – 2.6" TP | Direct (-A) |
| CBA-BA-400BS-A-B-Q (High Speed) | 400 mm (16") | 3420 | 10.0 HP | 380V 3-Phase | 3,552 – 6,635 CFM | 4.3" – 12.8" SP | 6.6" – 13.5" TP | Direct (-A) |
| CBA-BA-400BS-A-B-Q (Low Speed) | 400 mm (16") | 1720 | 1.5 HP | 220V 1/3-Phase | 1,776 – 3,318 CFM | 1.1" – 3.2" SP | 1.6" – 3.4" TP | Direct (-A) |
| CBA-BA-450BS-A-B-Q (High Speed) | 450 mm (18") | 3420 | 20.0 HP | 380V 3-Phase | 3,983 – 10,241 CFM | 3.6" – 17.0" SP | 6.9" – 17.5" TP | Direct (-A) |
| CBA-BA-450BS-A-B-Q (Low Speed) | 450 mm (18") | 1720 | 2.0 HP | 220V 1/3-Phase | 1,991 – 5,120 CFM | 0.9" – 4.2" SP | 1.7" – 4.4" TP | Direct (-A) |
| CBA-BA-500BS-A-B-Q (High Speed) | 500 mm (20") | 1720 | 4.0 HP | 380V 3-Phase | 2,931 – 6,918 CFM | 0.9" – 5.1" SP | 1.8" – 5.2" TP | Direct (-A) |
| CBA-BA-500BS-A-B-Q (Low Speed) | 500 mm (20") | 1120 | 1.5 HP | 380V 3-Phase | 1,962 – 4,906 CFM | 0.4" – 2.3" SP | 0.9" – 2.3" TP | Direct (-A) |
| CBA-BA-560BS-A-B-Q (High Speed) | 560 mm (22") | 1720 | 7.5 HP | 380V 3-Phase | 2,852 – 9,529 CFM | 1.4" – 6.3" SP | 2.6" – 6.5" TP | Direct (-A) |
| CBA-BA-560BS-A-B-Q (Low Speed) | 560 mm (22") | 1120 | 2.0 HP | 380V 3-Phase | 1,902 – 5,753 CFM | 1.0" – 2.8" SP | 1.4" – 2.9" TP | Direct (-A) |
| CBA-BA-630BS-A-B-Q (High Speed) | 630 mm (25") | 1720 | 15.0 HP | 380V 3-Phase | 6,178 – 14,118 CFM | 0.7" – 8.0" SP | 2.3" – 8.3" TP | Direct (-A) |
| CBA-BA-630BS-A-B-Q (Low Speed) | 630 mm (25") | 1120 | 4.0 HP | 380V 3-Phase | 4,076 – 8,824 CFM | 1.2" – 3.7" SP | 1.8" – 3.8" TP | Direct (-A) |
| CBA-BA-710BS-A-B-Q (High Speed) | 710 mm (28") | 1720 | 25.0 HP | 380V 3-Phase | 8,118 – 19,417 CFM | 0.8" – 9.9" SP | 3.6" – 10.4" TP | Direct (-A) |
| CBA-BA-710BS-A-B-Q (Low Speed) | 710 mm (28") | 1120 | 7.5 HP | 380V 3-Phase | 5,665 – 12,886 CFM | 0.2" – 4.7" SP | 1.8" – 4.9" TP | Direct (-A) |
Total pressure (TP) equals static pressure (SP) plus dynamic velocity pressure ($P_t = P_s + P_v$). Fan selection must overcome the external static losses of your connected duct run, dampers, and filters. Because maximum airflow and maximum static pressure are opposite curve endpoints, submit your project airflow and calculated static resistance for an engineered curve overlay.
CBA-BA series dimensional schedule
Factory certified casing dimensions, inlet spigot diameters, and rectangular outlet flange drilling patterns from catalogue page 9.
| Complete Model Code | Inlet Ø (D1 mm) | Outlet Flange (A1×A4 mm) | Height G (mm) | Width B (mm) | Depth J (mm) | Flange Holes | Base Holes |
|---|---|---|---|---|---|---|---|
| CBA-BA-250BS-A-B-Q | Ø 250 mm | 322 × 175 mm | 442 mm | 260 mm | 438 mm | 8-ø8 mm | 4-ø10 mm |
| CBA-BA-280BS-A-B-Q | Ø 280 mm | 360 × 195 mm | 488 mm | 260 mm | 460 mm | 8-ø8 mm | 4-ø10 mm |
| CBA-BA-315BS-A-B-Q | Ø 315 mm | 410 × 220 mm | 541 mm | 360 mm | 513 mm | 8-ø8 mm | 4-ø12 mm |
| CBA-BA-355BS-A-B-Q | Ø 355 mm | 456 × 243 mm | 600 mm | 430 mm | 570 mm | 10-ø8 mm | 4-ø12 mm |
| CBA-BA-400BS-A-B-Q | Ø 400 mm | 507 × 270 mm | 667 mm | 440 mm | 624 mm | 10-ø8 mm | 4-ø12 mm |
| CBA-BA-450BS-A-B-Q | Ø 450 mm | 572 × 304 mm | 744 mm | 480 mm | 638 mm | 10-ø8 mm | 4-ø14 mm |
| CBA-BA-500BS-A-B-Q | Ø 500 mm | 638 × 341 mm | 819 mm | 430 mm | 645 mm | 12-ø8 mm | 4-ø14 mm |
| CBA-BA-560BS-A-B-Q | Ø 560 mm | 721 × 378 mm | 906 mm | 430 mm | 713 mm | 12-ø8 mm | 4-ø14 mm |
| CBA-BA-630BS-A-B-Q | Ø 630 mm | 801 × 427 mm | 1014 mm | 550 mm | 973 mm | 18-ø10 mm | 4-ø16 mm |
| CBA-BA-710BS-A-B-Q | Ø 710 mm | 900 × 450 mm | 1138 mm | 608 mm | 1051 mm | 18-ø10 mm | 4-ø16 mm |
Engineered construction & design advantages
Heavy-duty fabrication designed for reliable commercial and industrial air movement in high-ambient Middle Eastern conditions.
Technical specifications
Reference engineering summary for MEP consultants, contractors, and procurement engineers.
| Specification Parameter | CBA Series Capability & Options |
|---|---|
| Product Category | High-Pressure Centrifugal Blower / Industrial Fan |
| Model Series | CBA-BA Direct Drive Series (United Electrical Supplies Factory Co.) |
| Available Sizes | CBA-BA-250BS through CBA-BA-710BS (10 casing sizes) |
| Configuration Count | 16 verified 60Hz documented operating rows |
| Airflow Capacity Range | 389 to 19,417 CFM operating range across fan curves |
| Static Pressure Range | Operating static pressures up to 17.0" SP (4,250 Pa) |
| Total Pressure Range | Total pressures up to 17.5" TP (4,375 Pa) |
| Drive Style | Direct-Drive (-A suffix) with rigid heavy-duty rear motor support bracket |
| Housing Materials | Carbon Steel (-Q, black powder-coated) or Stainless Steel (-S, silver finish) |
| Electrical Supply (60Hz) | 380V/60Hz 3-Phase (High Speed) & 220V/60Hz (Low Speed options) |
| Motor Power Range | 0.5 HP to 25.0 HP (0.37 kW to 18.5 kW) |
| Discharge Orientations | Standard 6 positions: RD 0°, RS 90°, RU 180°, LD 0°, LS 90°, LU 180° |
Industrial centrifugal blower applications
Where higher-pressure ducted airflow is required to overcome duct resistance, equipment loads, and air transfer requirements.
Project selection checklist & sizing parameters
To ensure accurate fan curve intersection and motor sizing, provide the following parameters for technical quotation.
Compatible installation & control accessories
Factory supplied options to facilitate duct connection, sound/vibration isolation, and outdoor weather protection.
Documentation, catalogues & submittals
Official catalogue with complete 60Hz performance curves, dimensional drawings, and procurement documentation.
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CBA direct drive centrifugal blower FAQs
Technical guidance on drive selection, static pressure calculations, electrical standards, and special application approvals.
Request CBA Direct Drive Blower Quotation & Submittal
Submit your required operating airflow (CFM at static pressure), drive preference (direct-drive CBA-BA vs. belt), voltage (220V/60Hz or 380V/60Hz), air condition, and project city in Saudi Arabia. Our engineering sales team will verify duty points and provide formal submittals.