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Additional Resources

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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.

Quality Products

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VI Series Exhaust Fans

SINCE 1948.

VI Series Exhaust Fans

The Triangle “VI” Series Heavy Duty Industrial Belt Drive Exhaust Fans are engineered to handle the demanding ventilation needs of industrial environments, including factories, warehouses, gymnasiums, greenhouses, and other similar applications. These fans are designed to deliver powerful airflow to maintain a healthy and safe indoor air quality.

The “VI” Series fans come equipped with several features that enhance their performance and durability. The fans feature a polyester powder-coated venturi, which promotes efficient airflow and protects against corrosion. Additionally, the heavy-gauge galvanized housing provides excellent resistance to corrosion, ensuring the longevity of the fan.

The Triangle “VI” Series Heavy Duty Industrial Belt Drive Exhaust Fans offer over 150 models with Open Drip-Proof (ODP), Totally-Enclosed (TE) and Hazardous Location motors (HL) to choose from. These fans are designed to meet the specific needs of different industrial environments and are available in a range of sizes and configurations to accommodate a variety of ventilation requirements.

Triangle has equipped both open drip-proof (ODP) and totally enclosed (TE) “VI” models, up to 1 ½ HP, with their innovative automatic “X-Wing” belt tensioner. This exclusive design reduces maintenance requirements and extends the life of both the belt and the motor, making these fans a cost-effective solution for industrial ventilation.

The variety of models available in the “VI” Series makes it easy for industrial facilities to choose the right fan for their specific requirements, whether they need a fan for a standard industrial environment or for a hazardous location. The Triangle “VI” Series fans are known for their reliability, efficiency, and durability, making them a smart investment for any industrial ventilation project.

In addition to the standard models, Triangle can design custom fans to meet specific customer requirements, including custom voltages and horsepower. This allows the customer to get the exact fan they need for their specific ventilation requirements, even if it falls outside of the standard offerings.

Whether a customer needs a custom voltage or a custom fan, Triangle has the expertise and experience to deliver a custom solution that meets their specific needs. With this level of customization and attention to detail, industrial facilities can be confident that they are getting a fan that is suited to their requirements.


  • Bronze powder coated rolled inlet venturi for efficient airflow
  • Rugged heavy gauge galvanized housing
  • Available in sizes from 24” to 60” blade diameter
  • Available with ODP, TE and HL motors
  • Belt drive
  • Optional Two-speed, 115V single-phase 1/3 and 1/2HP motors

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