QUALITYProducts.
SINCE 1948.

• All-Welded Steel Construction
  Resists harsh industrial conditions, ensuring long-term durability.
• External Belt Drive Configuration
  Keeps motors, shafts, belts, pulleys, and bearings out of the airstream, prolonging component life and simplifying routine checks.
• Extended Lubrication Lines
  Standard feature that streamlines bearing lubrication, minimizing service interruptions.
• High-Efficiency Airfoil Propellers
  Cast aluminum, non-overloading airfoil blades move air effectively with minimal noise or turbulence. Conventional flat blades cause excessive air turbulence which results in motor overloads and poor acoustic performance.
• Multiple Motor Options
  Standard (Totally Enclosed, Hazardous Location) and non-standard (Chemical Duty, 50 Hz, Arctic Duty, IEEE 841, ECM) configurations to match diverse environments.
• Rugged Weather Protection
  Heavy-gauge windband, curb base, and reinforced components for reliable performance in any climate.
• Proven Heritage
  Backed by more than 70 years of Triangle Engineering’s innovation and expertise.

Sizes & Models (24″–84″)

• Standard Diameters: 24″, 30″, 36″, 42″, 48″, 54″, 60″, 72″, 84″
• Airflow Range: up to 115,000+ CFM (Need higher airflow? Contact us to discuss custom configurations.)
• Horsepower: Up to 25 HP (contact us for higher horsepower requirements)

Construction & Finish

• Housing: Heavy-gauge, all-welded steel for structural integrity
• Polyester Powder Coat Finish: Resists corrosion, extends product life
• External Bracing: Reinforces larger units to prevent sagging and vibration
• Internal Bracing: Adds extra structural support
• Rain Channel: Directs rainwater away from the fan onto the roof

Additional Construction Details

• Curb Base: Heavy-gauge galvanized sheet steel, all-welded for long, maintenance-free service
• Windband: Galvanized steel with roll formed reinforcing ribs to protect against weather and crosswinds
• Throat: Deep venturi-type orifice welded to a galvanized steel inner throat for quieter, more efficient operation
• Butterfly Dampers: Automatically open when powered on and close via gravity to prevent backdrafts; bumper stops aid closure
• Damper Bearings: Sintered bronze-oil bushings on rustproof delrin rods, located outside the airstream for friction-free operation
• Neoprene Damper Gasket: Mounted around top of throat. Creates a damper seal, prevents freezing in cold conditions, and lessens noise as butterfly dampers close
• Lifting Lugs: Facilitate easier rigging and safer rooftop installation

Belt & Motor Arrangement

• Motor Out of Airstream: Motor, shaft, bearings, sheaves and belts remain protected from from the airstream.
• Extended Lubrication Lines (Standard): Perform bearing lubrication easily without dismantling major parts
• Self-Aligning Bearings & Balanced Sheaves: Ensures smooth belt operation, reduced wear, and extended service intervals
• Adjustable Motor Mounts: Offer precise belt tension and alignment, simplifying routine maintenance
• Quieter Operation: Belt drive system can run slower blade speeds, lowering overall noise levels

Standard Motor Types, Voltages & Controls

• Standard Motor Options: Totally Enclosed (TE), Hazardous Location (HL)
• Non-Standard: Chemical Duty, 50 Hz, Arctic Duty, High Ambient, IEEE 841, Electronically Commutated (ECM), etc.
• Standard Voltages:
  • Single-Phase: 115V, 230V
  • Three-Phase: 230V, 460V
    (Additional options: 277V, 208V, 415V, 575V)
• Motor Control: Consult factory for motor compatibility with Variable Frequency Drives (VFDs)

Operating Range

• Temperature: Handles up to 110°F (contact us for higher-temp motors)
• Static Pressure: Refer to performance tables for model-specific capabilities

Mounting & Installation

• Belt Drive Accessibility: Easier pulleys and bearings maintenance from the rooftop.
• Integral Butterfly Dampers: Minimize energy loss by reducing backdrafts when fan is off

Explore a range of add-ons and design modifications to further enhance functionality, reliability, and ease of maintenance. Whether you need additional weatherproofing, improved service access, or robust safety features, our suite of accessories ensures the JBX Series meets the unique demands of your industrial environment.

• Motor Cover: Shields the motor from rain, debris, or accidental contact

• Belt Guard: Protects the belt and sheaves from dust and damage

• Disconnect Switch: UL-listed, prewired for on-site safety

• Magnetic Latches: Help prevent butterfly damper uplift due to high winds

• VFD Ready: Premium Efficiency Inverter-Rated Motor for variable speed control

• Shaft Grounding: Minimizes bearing wear from stray electrical current

The JBX Series Belt Drive Upblast Exhaust Fan offers consistent, heavy-duty ventilation for a wide range of industrial and commercial settings. By protecting critical drive components outside the airstream, it excels in environments where contamination, heat, or moisture may threaten standard belt-drive assemblies.

• Manufacturing Plants: Pull hot air, fumes, or particulates away from production lines
• Warehousing & Distribution: Maintain breathable conditions in large, bustling interiors
• Foundries & Metalworking: Handle smoke, dust, and other byproducts of heavy industrial processes
• Power & Utility Rooms: Ensure adequate cooling for electrical components and generators
• Beverage & Food Processing: Control humidity, odors, and air quality for sanitary operations

• Reliability: Designed for heavy-duty use with a robust steel housing and the drive components outside the airstream

• Superior Airflow: Airfoil propellers consistently deliver high volumes of exhaust air

• Simplified Maintenance: With extended lubrication lines standard, belt and bearing checks become hassle-free

• Adaptable Configurations: Multiple horsepower, voltage, and material options for specialized needs

• Trusted Expertise: Over 70 years of Triangle Engineering’s industrial ventilation know-how

Complement or extend your ventilation system with these premium solutions:

• HHC Series Hooded Fans
  • Weather-resistant hooded exhaust fans designed for roof or wall mounting
• JD Series Direct Drive Roof Mount Exhaust Fan
  • Ideal for general ventilation where where reduced maintenance is critical
• JBI Series Belt Drive Roof Mount Exhaust Fan (motor inside airstream)
  • Ideal for general ventilation where the motor can be positioned in the air stream for effective cooling
• FHI Series Panel Exhaust or Supply Fan
  • Severe duty panel exhaust or supply fan, available in direct drive or belt drive configuration and designed for harsh environments
• Shutters/Dampers
  • Offered in standard sizes or custom increments (as small as 1/8″) to fit your opening. They regulate airflow, limit backdraft, and maintain optimal building pressure when the fan is off

We understand every project has distinct ventilation challenges. Beyond our standard JBX Series offerings, our team is available to work with you to fine-tune specific performance, material, and site criteria. Whether you require enhanced components for high temperatures, or specific airflow targets, our engineering team is prepared to deliver a tailored JBX Series configuration.

Custom Airflow Targets

We’ll identify the ideal propeller or blade design to meet your static pressure and performance needs, ensuring optimal airflow and efficient operation for your application.

High-Temperature Applications

Upgrade components and materials to withstand extreme operating conditions, factoring in reduced air density at high temperatures. We’ll also adjust propeller selection as needed to maintain proper airflow and performance.

MATERIAL OPTIONS

CONTACT FACTORY FOR AVAILABILITY OF ALUMINUM OR STAINLESS STEEL FOR LIGHTER WEIGHT OR ENCHANCED CORROSION RESISTANCE.

Have additional requirements? Looking for a unique finish or custom mounting configuration? Our experts can help you explore all possible solutions to fit your exact needs.

Contact Us to Get Started

Elevate your roof ventilation setup with the JBX Series Belt Drive Upblast Exhaust Fan—reliable airflow, simplified maintenance, and industrial-grade durability, all in one package.

Triangle Engineering—Over 70 years of delivering ventilation solutions that excel in demanding environments.