QUALITYProducts.
SINCE 1948.

The Go-To Industrial Exhaust Fan for Reliable Ventilation

Since 1948, Triangle Engineering has specialized in rugged ventilation solutions that stand up to the harshest industrial settings. The VI Series is our belt-drive, wall-mounted exhaust fan, carefully designed to draw out heated, contaminated, or stale air from demanding work environments. By removing airborne pollutants and reducing heat buildup, these fans help you maintain better air quality and a safer, more productive facility.

Key Features & Benefits

1. Belt-drive operation
   The VI Series utilizes a belt-drive system for reliable, efficient air movement. Models with open drip proof (ODP) or totally enclosed (TE) motors up to 1.5 hp include an automatic belt tensioner for reduced maintenance.
2. Robust wall-mounted design
   Engineered for installation on an exterior wall, these exhaust fans pull interior air out of your facility, creating negative pressure for consistent ventilation and improved air quality.
3. Simplified maintenance
   Belts, motors, and pulleys can be accessed from inside the building, minimizing downtime and labor costs. There is no need for exterior lifts or complex procedures.
4. Adaptable motor & voltage options
   Choose from 1/3 hp up to 5 hp in open drip proof (ODP), totally enclosed (TE), or hazardous location (HL) motors. Standard voltages include 115V or 230V (single-phase) and 230V or 460V (three-phase). Additional options such as 277V, 208V, 415V, or 575V are also available upon request.
5. Integrated galvanized wall box
   Each VI model arrives with a factory-installed galvanized steel wall box, offering a straightforward mounting process on any exterior wall. This setup streamlines installation and saves valuable time.
6. Rolled inlet venturi
   Each VI fan features a rolled inlet venturi finished with a durable polyester powder coat, helping improve overall airflow efficiency while withstanding tough industrial conditions.
7. Ships fully assembled & tested
   Every fan leaves our factory fully assembled and rigorously tested, speeding up on-site setup so you can get up and running quickly.

Technical Specifications

• Blade diameters: 24″, 30″, 36″, 42″, 48″, 54″, 60″
• Motor horsepower: from 1/3 hp up to 5 hp
  • Standard increments typically include 1/3, 1/2, 3/4, 1, 1.5, 2, 3, and 5 hp (other sizes may be available upon request)
• Motor enclosure: available in ODP, TE, or HL
• Automatic belt tensioner: included on ODP or TE models up to 1.5 hp
• Standard voltages:
  • Single-phase: 115V, 230V
  • Three-phase: 230V, 460V
    (Additional options: 277V, 208V, 415V, 575V)
• Drive access: belts, pulleys, and motor are serviceable from inside the building
• Fully assembled & factory-tested: ready for immediate installation and operation
• Construction: built with sturdy, industrial-grade materials and maintenance-friendly details to ensure reliable performance in tough environments
• Ambient temperature rating: suitable for applications up to 110°F. If your operation regularly exceeds 110°F, please contact us about higher ambient temperature motors.
• Performance data: airflow capacities range from approximately 4,190 CFM up to 41,000 CFM. For detailed performance at various static pressures, see the Triangle Engineering product catalog.

Available Accessories

Triangle Engineering offers a full line of accessories to complement VI Series exhaust fans, ensuring an optimal installation for your unique application. The following add-ons can be tailored to meet specific environmental and operational needs:

• Rainhoods
  Provide a protective cover against exterior elements, keeping critical fan components dry.
• Guards
  Enclose moving parts to safeguard personnel and equipment.
• 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.

Ideal Use Cases

• Manufacturing & Industrial Facilities: Remove fumes, dust, and excess heat from production lines or workstations.
• Warehouses & Storage Areas: Keep interior conditions more comfortable by venting out stale, hot air.
• Automotive & Aerospace Workshops: Extract hazardous fumes or chemical vapors, improving workspace safety.
• Food & Beverage Processing: Manage humidity, steam, and odor control while supporting food safety standards.
• Heavy Equipment & Foundry Operations: Exhaust hot air and metal fumes to protect personnel and equipment.
• Large Commercial Buildings: Vent out accumulated heat and odors, improving indoor air quality for employees and customers.

Why VI Series?

1. Reliability and durability
   Built in the USA with a blend of domestic and foreign components, Triangle Engineering has been an industry leader since 1948. We construct the VI Series to tackle challenging industrial exhaust applications.
2. Simple maintenance
   Service belts, motors, and pulleys from inside the building to avoid the need for exterior lifts or complex procedures.
3. Optimized workplace conditions
   Exhausting hot, stale, or contaminated air helps stabilize interior temperatures and improve air quality, promoting safety and comfort.
4. Flexible motor choices
   With horsepower options spanning 1/3 hp to 5 hp, plus open drip proof (ODP), totally enclosed (TE), or hazardous location (HL) enclosures, there’s a configuration for every industrial exhaust requirement.
5. Balanced airflow with supply fan
   For ideal indoor air quality, consider pairing your VI Series exhaust fan with a Triangle Engineering supply fan. This balanced approach helps replace exhausted air with fresh intake air, maintaining proper building pressure and ensuring optimal ventilation throughout your facility.

Why Choose Triangle Engineering?

A Legacy of Quality Since 1948

For more than seven decades, we have specialized in crafting top-tier ventilation products that stand up to demanding industrial environments. Our fans are factory-assembled, rigorously tested, and supported by an experienced customer service team.

Customized Solutions Available

Not seeing exactly what you need? We can customize our VI Series exhaust fans to meet your specific airflow requirements, unique motor setups, specialized construction or non-standard materials like stainless steel or aluminum. Contact us to learn how we can optimize your industrial exhaust needs.

Related Products

• V Series: Belt-drive commercial duty panel exhaust fans
• VID Series: Direct-drive wall mount cabinet exhaust fans
• FHI Series: Severe duty panel exhaust fan for harsh or high-temperature environments

Get Your VI Fan Today

Don’t let stagnant or contaminated air hinder operations. The VI Series industrial exhaust fan delivers robust airflow to help you maintain a cleaner, safer work environment, no matter how demanding your application may be.

Ready to enhance your facility’s ventilation? Request a quote or contact us to learn more about the VI Series and discover how it can transform your workspace.

Hazardous Location Models Resources:

View Drawings

Choose a model below to view drawing

24” VI2412HL-U VI2412HL-X VI2413HL-U VI2413HL-X

30” VI3012HL-U VI3012HL-X VI3013HL-U VI3013HL-X VI3014HL-U VI3014HL-X

36” VI3613HL-U VI3613HL-X VI3614HL-U VI3614HL-X VI3615HL-U VI3615HL-X VI3616HL-U VI3616HL-X VI3617HL-U VI3617HL-X VI3618HL-X

48” VI4817HL-U VI4817HL-X VI4818HL-U VI4818HL-X VI4819HL-X

54” VI5417HL-U VI5417HL-X VI5418HL-U VI5418HL-X VI5419HL-X

60” VI6017HL-U VI6017HL-X VI6018HL-U VI6018HL-X VI6019HL-X