Backward curved centrifugal fans are in high demand across industries ranging from HVAC to manufacturing, prized for their exceptional efficiency, high static pressure, and quiet operation. Whether you’re upgrading an existing ventilation system, outfitting a new facility, or replacing a wornout fan, understanding the options available for sale is critical to making an informed purchase. From compact models for cleanrooms to heavyduty industrial units, backward curved centrifugal fans come in a variety of sizes, configurations, and performance ratings, each tailored to specific applications. This guide explores the types of backward curved centrifugal fans for sale, key factors to consider when buying, top models from leading manufacturers, and tips for sourcing the right fan for your needs—ensuring you balance performance, cost, and longterm reliability.

Types of Backward Curved Centrifugal Fans Available for Sale

Backward curved centrifugal fans for sale are categorized by their design, application, and performance characteristics, allowing buyers to match the fan to their specific requirements:

By Application

HVAC Fans: Designed for commercial and industrial heating, ventilation, and air conditioning systems. These fans typically deliver 1,000–20,000 CFM with 2–8 inches of static pressure, ideal for ductwork in offices, hospitals, and shopping malls. Models often feature EC motors for energy efficiency and integration with building management systems (BMS).

Industrial Exhaust Fans: Built to remove fumes, dust, and heat from manufacturing facilities. They handle 5,000–50,000 CFM and are constructed with durable materials (steel, aluminum) to withstand harsh environments. Many include features like corrosionresistant coatings for chemical plants or sparkresistant components for hazardous locations.

Cleanroom Fans: Precisionengineered to maintain strict air quality standards in pharmaceutical labs, semiconductor facilities, and food processing plants. These fans offer 80–85% efficiency, low noise (55–65 dB), and smooth surfaces to prevent particle buildup. They often come with HEPA filter compatibility and stainless steel construction.

HighTemperature Fans: Specialized models rated for continuous operation at 200–500°C (392–932°F), used in foundries, glass manufacturing, and incineration plants. They feature heatresistant ceramics, motor isolation, and reinforced housings to withstand extreme heat.

By Configuration

DirectDrive Fans: The impeller mounts directly on the motor shaft, eliminating belts and pulleys for higher efficiency (95–98% mechanical efficiency) and lower maintenance. These are compact and ideal for spaceconstrained applications like rooftop units or inline duct installation. Sizes range from 6–36 inches in diameter, with airflow up to 30,000 CFM.

BeltDriven Fans: Use a belt and pulley system to connect the motor to the impeller, allowing speed adjustment by changing pulley sizes. They are larger and more powerful (up to 100,000 CFM) than directdrive models, suitable for large industrial facilities with variable airflow needs, such as warehouses or power plants.

Inline Fans: Designed to fit within ductwork, with a cylindrical housing that minimizes space requirements. They are used to boost airflow in long duct runs or to ventilate specific areas like server rooms or laboratory fume hoods. Inline models are available in both directdrive and beltdriven configurations.

RoofMounted Fans: Weatherproof fans installed on building rooftops to exhaust air from large spaces. They feature rugged housings to withstand rain, snow, and UV exposure, making them popular for warehouses, distribution centers, and manufacturing plants.

Key Features to Look for When Buying Backward Curved Centrifugal Fans

When evaluating backward curved centrifugal fans for sale, several features directly impact performance, efficiency, and suitability for your application:

Performance Metrics

Airflow (CFM): The volume of air the fan moves, measured in cubic feet per minute. Choose a fan with CFM exceeding your calculated needs (accounting for duct losses). For example, a 10,000squarefoot facility requiring 6 air changes per hour needs a fan rated for at least 8,000 CFM (10,000 sq ft × 8 ft ceiling × 6 ACH / 60 minutes).

Static Pressure (inH₂O): The pressure the fan generates to overcome resistance from ductwork, filters, and elbows. Fans for commercial HVAC typically need 2–5 inches of water, while industrial systems with long ducts or highefficiency filters may require 5–10+ inches.

Efficiency: Look for fans with 80–85% static efficiency to minimize energy costs. EC motors are more efficient than AC motors, reducing power consumption by 20–30%—a critical factor for 24/7 operations.

Construction and Materials

Impeller Material: Aluminum is lightweight and corrosionresistant, ideal for clean or moderately dusty environments. Steel offers durability for abrasive applications (e.g., mining dust). Stainless steel (304 or 316) is used in corrosive environments like chemical plants or coastal areas.

Housing Material: Galvanized steel provides generalpurpose durability, while powdercoated steel resists rust in humid conditions. Fiberglassreinforced plastic (FRP) is used in highly corrosive settings (e.g., wastewater treatment plants).

Bearings: Sleeve bearings are costeffective for lowvibration applications with lifespans of 20,000–30,000 hours. Ball bearings offer longer life (30,000–50,000 hours) and better tolerance for high temperatures and vibration, making them ideal for industrial use.

Safety and Compliance

Certifications: Ensure the fan meets relevant standards:

UL/ETL listing for electrical safety.

ATEX or IECEx certification for hazardous locations (e.g., oil refineries, grain elevators).

ENERGY STAR® or EU Ecodesign compliance for energy efficiency.

FDA or USDA approval for food processing applications (stainless steel, easytoclean design).

Overload Protection: Backward curved fans’ nonoverloading 特性 prevents motor burnout if airflow is restricted (e.g., by clogged filters), a critical safety feature for unattended systems.

Control and Automation

Variable Speed Drives (VSDs): Allow airflow adjustment based on demand, reducing energy use by 30–50% compared to fixedspeed fans. VSDs are essential for applications with variable loads, such as office buildings with fluctuating occupancy.

IoT Connectivity: Smart fans with builtin sensors monitor vibration, temperature, and airflow, transmitting data to cloud platforms for remote monitoring. This enables predictive maintenance, alerting users to issues before failure (e.g., bearing wear or filter clogs).

Top Backward Curved Centrifugal Fan Models for Sale

Leading manufacturers offer a range of backward curved centrifugal fans for sale, each with unique strengths. Here are standout models across applications:

1. ebmpapst RadiCal R3G450

A topselling directdrive backward curved fan, the R3G450 is ideal for HVAC and clean industrial environments. Key specs:

Airflow: 5,000–15,000 CFM

Static Pressure: Up to 8 inches of water

Efficiency: 82%

Noise: 60–70 dB

Motor: EC motor with PWM speed control

Construction: Aluminum impeller, steel housing with powder coating

Certifications: ENERGY STAR®, CE, UL

Common uses: Commercial HVAC, data center cooling, food processing facilities. Available through ebmpapst’s global distributors, with prices ranging from \(800–\)1,500 depending on configuration.

2. Greenheck PRV122 Power Roof Ventilator

A beltdriven roofmounted fan designed for industrial exhaust. Key specs:

Airflow: 10,000–30,000 CFM

Static Pressure: Up to 10 inches of water

Efficiency: 78%

Noise: 70–75 dB

Motor: 5–15 HP AC motor with VSD compatibility

Construction: Galvanized steel housing, aluminum impeller

Certifications: UL, AMCA certified for performance

Common uses: Warehouses, manufacturing plants, distribution centers. Priced from \(2,500–\)5,000, available through Greenheck’s network of dealers and online industrial suppliers.

3. Systemair Sileo 500

A compact directdrive fan for cleanrooms and laboratories. Key specs:

Airflow: 1,000–5,000 CFM

Static Pressure: Up to 6 inches of water

Efficiency: 80%

Noise: 55–65 dB

Motor: EC motor with integrated controller

Construction: Stainless steel impeller and housing (optional), smooth surfaces for easy cleaning

Certifications: ISO 146441 (Class 5 cleanroom compatible), FDA compliant

Common uses: Pharmaceutical labs, semiconductor cleanrooms, medical device manufacturing. Prices start at \(1,200–\)2,500, sold through Systemair’s industrial distributors.

4. ZiehlAbegg RadiCal Blue R4D500

A premium highefficiency fan for energyconscious facilities. Key specs:

Airflow: 10,000–25,000 CFM

Static Pressure: Up to 10 inches of water

Efficiency: 85%

Noise: 65–72 dB

Motor: EC motor with adaptive speed control

Construction: Composite impeller (carbon fiber reinforced), corrosionresistant housing

Certifications: ENERGY STAR®, ATEX (optional), UL

Common uses: Data centers, green buildings, industrial HVAC with high energy standards. Priced from \(1,800–\)3,500, available through ZiehlAbegg’s authorized partners.

5. Continental Fan BC12

A budgetfriendly directdrive fan for small to medium industrial applications. Key specs:

Airflow: 1,000–5,000 CFM

Static Pressure: Up to 5 inches of water

Efficiency: 78%

Noise: 65–75 dB

Motor: AC motor with optional VSD

Construction: Steel impeller and housing

Certifications: UL, CE

Common uses: Small warehouses, electronics manufacturing, light industrial exhaust. Prices range from \(400–\)800, sold through Continental Fan’s North American distributors and online retailers like Amazon Business or Grainger.

Where to Buy Backward Curved Centrifugal Fans

Backward curved centrifugal fans for sale are available through various channels, each with advantages for different buyers:

Industrial Distributors

Grainger: A leading distributor of industrial supplies, offering a wide range of fans from brands like ebmpapst, Greenheck, and Continental Fan. Grainger provides sameday shipping on instock items and technical support via phone or online chat. Ideal for small to medium buyers needing quick delivery.

RS Components: A global distributor with a strong focus on technical specifications, RS Components offers detailed datasheets and comparison tools to help buyers select the right fan. They serve industrial and commercial clients, with bulk pricing for large orders.

Motion Industries: Specializes in industrial maintenance, repair, and operations (MRO) supplies, including backward curved fans. They offer custom configuration services (e.g., adding explosionproof components) and local delivery through a network of branches.

Manufacturer Direct

Buying directly from manufacturers like ebmpapst, Greenheck, or ZiehlAbegg is ideal for large orders or custom projects. Benefits include:

Access to engineering support for system design.

Customization options (e.g., specialized coatings, motor upgrades).

Volume discounts for bulk purchases (10+ units).

Warranty support directly from the manufacturer (typically 3–5 years).

Online Marketplaces

Amazon Business: Offers a selection of small to medium backward curved fans (up to 10,000 CFM) from brands like Continental Fan and ebmpapst. Prime members benefit from fast shipping, and business accounts can access taxexempt purchasing and volume pricing.

eBay Industrial: Features new and refurbished backward curved fans, often at discounted prices. Buyers should verify seller ratings and check for certifications (e.g., UL, CE) before purchasing.

 Alibaba: A source for budgetfriendly fans from Chinese manufacturers like Guangzhou Hao Ting Fan. Suitable for buyers prioritizing cost over brand, but ensure compliance with local standards (e.g., UL for North America).

Local HVAC and Industrial Suppliers

Regional suppliers often stock popular models and provide onsite support, including installation and maintenance. They are particularly valuable for buyers needing:

Local code compliance guidance (e.g., meeting city or state ventilation regulations).

Emergency replacement fans (sameday delivery for critical failures).

Installation services, including ductwork integration and electrical connections.

Sourcing Considerations: Buying Backward Curved Centrifugal Fans

Purchasing a backward curved centrifugal fan involves more than selecting a model—it requires aligning the fan with your longterm needs and budget:

Total Cost of Ownership (TCO)

While upfront cost is a factor, TCO includes energy use, maintenance, and lifespan:

Energy Costs: An EC motor fan costing \(1,500 may save \)300–\(500 annually in energy bills compared to a \)800 AC motor fan, offsetting the higher initial price in 2–3 years.

Maintenance: Beltdriven fans require more frequent maintenance (belt replacement, pulley alignment) than directdrive models, adding \(100–\)300/year in labor costs.

Lifespan: Ballbearing fans last 30,000–50,000 hours (3–5 years of continuous use), while sleevebearing models last 20,000–30,000 hours, requiring earlier replacement.

Lead Times

Standard models from major distributors are often in stock (1–3 day delivery). Custom fans (e.g., explosionproof or hightemperature models) may have lead times of 2–6 weeks, so plan accordingly for new construction or facility upgrades.

Warranty and Support

Look for fans with 3–5 year warranties covering parts and labor. Manufacturers like ebmpapst and Greenheck offer extended warranties (up to 10 years) for registered products, reflecting confidence in their durability. Ensure the seller provides local service support—critical for resolving issues quickly.

Compliance with Regulations

Verify the fan meets local standards:

North America: UL/ETL listing, OSHA noise standards (<85 dB for 8hour exposure), and DOE efficiency requirements.

Europe: CE marking, ATEX for hazardous locations, and EU Ecodesign Directive compliance.

Asia: CCC certification in China, PSE in Japan, and TUV SUD in Southeast Asia.

Environmental Factors

Consider the operating environment when selecting materials:

Dusty/abrasive: Choose steel impellers with wearresistant coatings.

Corrosive: Opt for stainless steel (316) or FRP housings.

Humid: Ensure the fan has sealed bearings and rustresistant finishes.

Conclusion: Finding the Right Backward Curved Centrifugal Fan for Sale

Backward curved centrifugal fans for sale offer a versatile solution for efficient, highpressure air movement, with options ranging from compact HVAC models to heavyduty industrial exhaust systems. By focusing on key features—airflow, static pressure, efficiency, and compliance—buyers can narrow down options to match their application. Leading models like the ebmpapst RadiCal and Greenheck PRV122 stand out for their reliability, while budgetfriendly options from Continental Fan or Chinese manufacturers cater to costsensitive buyers.

Whether purchasing through industrial distributors, manufacturer direct, or local suppliers, prioritizing total cost of ownership—including energy savings and maintenance—ensures longterm value. With the right fan, facilities can achieve optimal air quality, regulatory compliance, and energy efficiency, making the investment in a backward curved centrifugal fan a critical step toward safe, sustainable operations.