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Frequently Asked Questions View all FAQs
How do you order the correct replacement parts?

Before ordering replacement parts, make sure you have the fan model and serial number.

Where can I find instructions to wire a motor on my fan?

The nameplate of the motor includes a wiring diagram. Wiring diagrams can also be found beneath the motor image in our Buy Parts section. Simply click the wiring diagram icon to view it.

Can I install a thermostat?

Yes, but only if the thermostat has a simple on/off operation. Please note: if the thermostat varies the amount of voltage delivered, it will damage the motor and void the warranty.

Can I install my whole house fan vertically?

Comfort Cooler (CC) series whole-house fans may be mounted vertically, however, the AS and CSS shutters will not function properly in the vertical position. We do not carry a ceiling shutter for vertical installation. Vertical installation instructions.

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JBI Series Belt Drive Upblast Exhaust Fans

QUALITYProducts.
SINCE 1948.

JBI Series Belt Drive Upblast Exhaust Fans

Since 1948, Triangle Engineering has delivered industrial ventilation solutions, backed by over 70 years of expertise. The JBI Series Belt Drive Upblast Roof Exhaust Fan combines an all-welded steel housing with belt-driven motors and high-efficiency cast aluminum airfoil propellers. Designed for commercial or industrial use, these fans range from 24″ to 84″ in diameter, with motors up to 25 HP, offering ample airflow for varied needs.

By situating the drive inside the airstream, the JBI Series balances performance and servicing. Steel construction withstands tough environments, while its belt drive system provides precise airflow. From manufacturing floors to power and utility sites, JBI upblast exhaust fans excel in demanding applications needing reliable roof-mounted exhaust.

Optional enhancements, including specialized materials or high-temp upgrades, expand their capabilities. Whether tackling dust, heat, or fumes, JBI fans deliver the longevity and efficiency modern facilities expect.

  • All-Welded Steel Construction
    Withstands harsh industrial conditions and ensures long-term durability.
  • Belt Drive Configuration
    Ideal for a broad range of airflow requirements and quieter operation.
  • 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 in Airstream: Belt and pulley system is located within the airflow path
  • Multiple Motor Enclosures: Totally Enclosed (TE), Hazardous Location (HL), and other specialized enclosures available
  • Heavy-Duty Bearings & Sheaves: Built with self-aligning pillow block ball bearings, dynamically balanced cast iron sheaves, taper lock bushings, and extra-strength V-belts for smooth, extended service life.
  • Belts & Sheaves Sized for Longevity: Engineered to handle heavy loads, ensuring long service intervals.
  • Adjustable Motor Mounts: Allow for proper belt tension and alignment, simplifying routine maintenance.
  • Slower Blade Speeds: Belt drive design fosters quieter operation and prolonged equipment life.

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 inside the building
  • 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 JBI Series meets the unique demands of your industrial environment.

  • Disconnect Switch: UL-listed, prewired switch for on-site safety
  • Magnetic Latches: Help prevent butterfly damper uplift due to high winds
  • VFD Ready: Premium Efficiency Inverter-Rated Motor
  • Shaft Grounding: Minimizes bearing wear from stray electrical current

The JBI Series Belt Drive Upblast Exhaust Fan ensures reliable airflow and comfort in a range of demanding industrial and commercial environments. Whether managing air quality on a busy production line or providing vital ventilation in power and utility settings, JBI fans are built to handle diverse challenges with ease. Explore the applications below to learn how their rugged, belt-driven design and simplified maintenance can benefit your operation.

  • Manufacturing Plants: Remove fumes, heat, and particulates for a safer workspace
  • Warehousing & Distribution: Sustain fresh air exchange in large, busy buildings
  • Foundries & Metalworking: Vent smoke, dust, and heavy industrial byproducts
  • Power & Utility Rooms: Ensure proper cooling of electrical equipment
  • Beverage & Food Processing: Maintain sanitation standards by controlling humidity and odors
  1. Reliability: Heavy-duty housing and belt-drive assembly, featuring self-aligning bearings and balanced sheaves, provides consistent performance and extended service life.
  2. Superior Performance: Airfoil blades deliver steady, high-volume airflow.
  3. Flexible Maintenance: Accessible belts and pulleys simplify routine upkeep.
  4. Tailored Configurations: Multiple horsepower, voltage, and specialty options.
  5. Backed by Experience: Over 70 years of industrial ventilation expertise.

Complement or extend your ventilation system with these premium solutions:

We understand every project has distinct ventilation challenges. Beyond our standard JBI 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 JBI 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 JBI 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.

Details

  • Available in 24” to 84” diameters.
  • Polyester powder coat finish
  • Motor, belt drive and pulleys are inside the airstream
  • Fan serviced from interior of building
  • Heavy gauge galvanized sheet steel curb base
  • All welded construction gives long maintenance-free service
  • Cast aluminum airfoil blades mounted on heavy duty cast aluminum fixed pitch hub for quiet, efficient operation.
  • Galvanized sheet steel wind band with two formed reinforcing ribs. It affords protection from weather and cross winds
  • Galvanized steel inner throat is riveted to the deep venturi-type orifice for quieter, more efficient operation
  • EXTERNAL BRACING used on larger units to give extra rigidity and prevent sagging and vibration
  • DAMPER LIDS open/close automatically when fan is turned on/off
  • Adjustable neoprene tipped positive bumper stops assure closure of damper lids when fan is cut off, yet permit maximum air flow when open

See full specifications for sizing and performance data

View Full Specs

Hazardous Location Models

Hazardous location models are made to order and are not returnable.

  • No wiring
  • Non-sparking aluminum blades
  • Stationary motor mounts
  • Belt drive: single speed, Div. I, Class I, Group D & Class II, Groups F & G