Centrifugal Fans

Introduction

Greenheck's airfoil and backward-inclined centrifugal fans are designed to provide efficient and reliable operation for commercial and industrial applications. Manufactured with state-of-the-art laser, forming, spinning, and welding equipment, these fans endure rigorous quality control testing to ensure trouble-free start-up. Greenheck centrifugal models incorporate industry-leading design features for advanced ventilation equipment.

Key Features:

• AMCA licensed performance
• Permalock™ or all welded scroll design
• Set screw or concentric mount bearings with industry-leading cataloged bearing life
• Corrosion-resistant, electrostatically applied and baked powder coatings
• Belt and direct drive configurations
• Galvanized, coated steel, aluminum, or stainless construction materials
• UL/cUL approvals for electrical, kitchen grease, and high temperature operation

Made in U.S.A. Models SWD, USF, and CSW fans are built in Schofield, WI, and Shelby, NC, enabling faster delivery.

Model Availability & Quick Build

Certified data is available via Greenheck's Computer Aided Product Selection program (CAPS).

Quick Build Availability

Models SWD, USF, and CSW fans are available in as little as 5 days through the Quick Build program, offering various lead times.

Applications

Greenheck centrifugal products are specified for a variety of commercial and industrial projects, including:

• General supply, return, or exhaust systems
• Emergency smoke exhaust (buildings, car parks, etc.)
• Restaurant grease exhaust
• Stairwell pressurization
• Process heat exhaust
• Filter houses and dust collectors
• Built-up or custom air handlers
• Spark-resistant fume exhaust
• Corrosive fume exhaust
• Grain drying

Application Categories:

Light Duty Commercial and Institutional:

For general ventilation in office spaces, retail, cafeterias, break rooms, and conference rooms. Suitable for environments with clean air, typically below 8,000 cfm and static pressures less than 3 in. wg. Galvanized housing and bolted construction are appropriate.

Models: SWD, USF-200

Commercial and Institutional:

For warehouses, hotels, atriums, theaters, gyms, and libraries. Handles larger air volumes up to 20,000 cfm with low to moderate static pressures up to 5 in. wg. Air quality is relatively clean, used for supply or exhaust. Fan coatings are available for cosmetic appearance or weather protection. May require certification for emergency conditions.

Models: SWD, USF-200, USF-300

Light Industrial and Specialty Commercial:

For wastewater treatment, garage exhaust, restaurants, mechanical rooms, manufacturing spaces, dedicated exhaust hoods, emergency smoke, natatoriums, and cleanrooms. Covers a wide airflow range (very low to 60,000 cfm) with moderate pressures below 8 in. wg. Applications may involve increased chemicals or particulates. Specialized coatings and spark resistance options are available.

Models: SWD, USF-300, USF-400, CSW

Industrial:

For process exhaust, fume exhaust, chemical processing, high temperatures, high humidity, and vibration-sensitive areas. Requires robust construction for high volumes and pressures. Welded scroll housings and frames, specialized coatings, and corrosion-resistant materials are common. High durability is critical for process operation and safety.

Models: USF-400, CSW

Specialized Applications:

Emergency Smoke (UL/cUL Listed):

For atriums, libraries, and multi-story buildings. Fans are designed for emergency use on dedicated systems or dual applications, built to withstand emergency smoke situations. Models USF-300, USF-400, and CSW are available with UL/cUL Power Ventilators for Smoke Control Systems listing. Suitable for temperatures up to 1000°F (538°C) for short durations.

High Temperature Process Exhaust:

For kilns, dryers, and furnaces involving temperatures above 250°F (121°C). Features high-temperature shaft seals, heat slingers, bearings, and coatings. Model CSW is available with specific temperature ratings and materials.

Chemical and Hazardous Exhaust:

For petrochemical, mills, fertilizer, and poultry barns. Requires higher performance coatings or corrosion-resistant materials (stainless steel or aluminum) for environments with high concentrations of hazardous chemicals.

Model: CSW

Restaurant Grease Exhaust (UL/cUL 762 Listed):

Designed for high-pressure restaurant grease exhaust. Available with Permalock™ or welded housing, meeting UL/cUL listing for restaurant exhaust appliances. Handles duct temperatures exceeding 400°F (204°C).

Models: USF-300, USF-400, CSW

Performance & Tiered Offering

Greenheck's centrifugal fans offer a wide range of airflow and static pressure capabilities. The performance curve graphically represents the relationship between Static Pressure and Volume (CFM) for various models (SWD, USF-200, USF-300, USF-400, CSW-BI, CSW-AF).

Greenheck's tiered model approach provides flexibility in size, performance, and construction. Selection tools like AutoCAD® and Revit™ models, eCAPS®, and CAPS™ software aid in choosing the appropriate model with options for energy efficiency and precise control.

Model Capacities and Static Pressure:

SWD Model with Vari-Green® Motors

The SWD model offers numerous advantages, including higher operating efficiencies and non-overloading horsepower curves. It is exclusively offered with Vari-Green® electronically commutated (EC) motors for energy efficiency and ease of control.

Vari-Green® Motor Benefits:

• Initial Cost: Similar to belt drive.
• Operating Cost: Lower operating costs.
• Maintenance: No maintenance required for belts, pulleys, or bearings.
• Control: Easy RPM adjustment via dial or 0-10 VDC signal.
• Efficiency: Operates on AC power converted to DC for higher efficiency (up to 85%), reducing energy consumption.
• Durability: Operates cooler at lower RPMs, extending motor life.
• Flexibility: Offers 80% usable RPM turndown compared to 30% for AC single-phase direct drive.
• Application: Ideal for demand-controlled ventilation.

Motor Information (SWD):

Vari-Green® Controls:

• Transformer: Provides 24V power for motor and controls.
• Remote Dial: Allows remote manual airflow adjustments.
• Two-Speed Control: Sets motor RPM to two speeds (high/low) via dry contact or AC digital input.
• Constant Pressure Control (Indoor/Outdoor): Controls motor via static or velocity pressure for system balance.
• Air Quality Control (VOC/Temp/Humidity): Adjusts motor speed based on VOC levels, temperature, or humidity.

Demand Controlled Ventilation:

SWD fans with Vari-Green controls can reduce energy use by decreasing fan speed when demand is low, leading to lower operating costs for heating and cooling in multi-story buildings.

Configurations

Greenheck fans are available in various arrangements, discharge positions, and motor configurations.

Arrangement Types:

• Arrangement 10 (Belt Drive): Recommended for belt drive applications; bearings out of airstream; motor beneath drive frame. Suitable for up to 500°F (260°C) heat packages.
• Arrangement 9 (Belt Drive): Bearings out of airstream; easy access to large motors; standard motor position on right side of drive frame. Suitable for up to 500°F (260°C) heat packages.
• Arrangement 1 (Belt Drive): Bearings out of airstream; unlimited motor size; requires isolation base; suitable for high temperatures or contaminated air; available with heat fan packages up to 1000°F (538°C).
• Arrangement 3 (Belt Drive): Bearings in airstream; unlimited motor size; requires isolation base; recommended for clean air at ambient temperatures.
• Arrangement 4 (Direct Drive): Available with partial width wheel/housing modifications; recommended for higher horsepower applications; limited to standard motor speeds but VFD compatible; compact design.
• Arrangement 8 (Direct Drive): Similar to Arrangement 4; bearings out of airstream; suitable for high temperatures or contaminated air; available with heat fan packages up to 750°F (400°C).

Discharge Positions:

Fans are available with clockwise (CW) or counterclockwise (CCW) rotation. Common discharge positions include Upblast (UB), Top Angular Upblast (TAU), Top Horizontal (TH), Top Angular Downblast (TAD), Downblast (DB), Backward Angular Downblast (BAD), Backward Horizontal (BH), and Backward Angular Upblast (BAU).

Motor Positions (Arrangements 1 & 3 CSW):

Fans require a structural base; motor can be in three positions (W, Z, X/Y) around the fan shaft for alignment. Positions W and Z create a longer footprint; X/Y create a shorter, wider footprint.

Class of Construction:

Fan class (0 to IV) denotes construction level for outlet velocity and pressure. Class 0 is lightest, Class IV is heaviest. A typical fan curve illustrates shaded class limits.

Construction and Material Options

Wheel Types:

• Backward Inclined (BI): General purpose, clean air, or severe environments; up to 1000°F (538°C); available in Steel, Aluminum, 316 Stainless Steel.
• Airfoil (AF): Clean air or fume exhaust; up to 500°F (260°C); available in Steel, Aluminum.

Housings:

• Permalock™ Housings: Mechanically fastened seam, airtight and watertight; suitable for applications up to 8.5 in. wg (2.1 kPa).
• Welded Housings: Heavy gauge, welded construction; common for industrial applications; suitable for pressures up to 22 in. wg (5.5 kPa).

Alternative Materials:

Aluminum or stainless steel (316L) construction is available for specific applications requiring high moisture, chemicals, or high heat resistance (up to 1000°F/538°C).

Spark-Resistant Construction:

Available for applications involving flammable particles, fumes, or vapors, adhering to AMCA Standard 99-0401-86. Options include nonferrous materials for airstream contact parts (Spark A), fan wheel (Spark B), and inlet cone (Spark C).

CSW Material Availability:

*Consult factory for sizes and options beyond cataloged. Not all wheel types, sizes, or classes are available in all arrangements.

Protective Coating Options:

Greenheck offers various electrostatically-applied baked powder coatings for durable, long-lasting finishes, suitable for corrosive applications. Coatings like Perma-Z and Hi-Pro Z offer superior corrosion resistance compared to industry standards. Chemical resistance ratings are provided for various coatings against common chemicals.

Value Added Construction

Premium Bearings:

Belt drive fans feature self-aligning ball or roller pillow block bearings with L10 life exceeding 80,000 hours (400,000 hrs. L50). USF-400 and CSW models use concentric locking collars for smoother operation. CSW models offer bearings with a minimum L10 life exceeding 200,000 hours (1,000,000 hrs. L50) for critical applications.

Vibration Analysis:

All centrifugal wheels undergo computerized balance analysis to Grade G 6.3. CSW products also receive mechanical vibration testing. Data acquisition systems measure vibration, and records are kept on file. Standard "filter-in" vibration levels meet AMCA Standard 204-05 requirements.

CSW Split Housings:

Quad split housings are available for space-saving installations, particularly in retrofit projects. Not available for 45° discharges (TAD, BAU).

Accessories

A range of accessories enhance fan functionality and integration:

• Fan Monitoring System (FMS): Monitors equipment health, maintenance, and energy usage.
• Sure-Aire™ Airflow Monitoring Station: Measures fan flow with 3% accuracy without impacting performance.
• Motor Starters: Provide motor protection against over-amping.
• Vibration Isolators and Isolation Bases: For simplifying field assembly and reducing transmitted vibrations. Options include Direct Mount, Mounting Rails, Isolation Bases, and Inertia Bases.
• Weatherhoods: Protect motor and drive components from elements.
• Belt Guards, Shaft Guards: For safety and access.
• Motor Covers: Weatherproof protection for outdoor installations.
• Inlet and Outlet Guards/Flanges: For protection and connection.
• Access Doors: For cleaning and inspection.
• Drain with Plug: For water drainage from the housing.
• Heat Slingers: Dissipate heat conducted along the fan shaft.
• Stainless Steel Shafts: For applications with excessive corrosion or heat stress.
• Shaft Seals: For high temperatures or contaminated air.
• Extended Life Bearings: For enhanced reliability.
• Extended Lubrication Lines: For easier bearing lubrication.
• Disconnect Switches: For electrical safety.
• Grease Containment: Traps grease residue.
• Backdraft Dampers: Prevent reverse airflow.
• Volume Control Dampers: Regulate airflow.
• VFD Rated Motors: Compatible with Variable Frequency Drives for energy savings.

Engineering Data & Selection

Selection Process:

Fan selection involves determining air volume and system resistance. Factors like duct layout, size, coils, filters, and dampers affect resistance. Optimal selection considers initial cost, operating cost, space, and sound levels. It's advisable to select fans that allow for adjustments and avoid those near stall conditions or excessive RPMs (above 2700 RPM) to prevent performance issues and vibration.

Effects of Installation on Performance:

Fan ratings are based on AMCA Standard 210, using open inlet and straight outlet ducting for maximum static regain. Deviations from this standard, such as restricted or unstable inlet flow, can cause pre-rotation, uneven loading, system losses, and increased sound. Turbulent discharge flow also results in system effect losses. Diagrams illustrate 'GOOD' and 'POOR' inlet and discharge configurations affecting performance.

Model Number Code

Greenheck's model number codes are designed to precisely identify fan construction, size, and performance. Each component of the code specifies details such as Model (SWD, USF, CSW), Fan Size, Motor HP, Blade Type (BI/AF), Housing (Permalock/Welded), Arrangement, Rotation (CW/CCW), Discharge Position, Certification (UL/cUL), and Fan Class.

Design and Selection Support

Greenheck offers comprehensive services including a Quick Delivery Program, Quick Build options, the free Computer Aided Product Selection program (CAPS), and Revit™ 3D drawings. These services support customers before, during, and after the sale, emphasizing energy efficiency and sustainability.

Greenheck is committed to continuous improvement and reserves the right to change specifications without notice. Warranty information is available on greenheck.com.