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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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Don’t Buy A Half-House Fan
Don’t Buy A Half-House Fan

SINCE 1948.

We practically invented the whole house fan

Many whole-house fans on the market generate less than 1,000 CFM per unit, which only cools a fraction of the typical home. This is something our founder, Uncle John Felter, told consumers back in 1983. 

We sell whole house fans, because you don’t live in half of your house. Consumers have been buying fans too small to cool their homes.

John Q. Felter, Founder

Helping Homeowners Cut Energy Costs

Uncle Felter was finding ways to help homeowners cut energy costs while creating comfort decades ago. His wisdom still holds true today.

A whole house fan is comprised of two parts: fan and attic ventilation. The square footage of your home will determine the CFMs required to adequately cool your home. CFM requirements should be used to choose the correct fan size. It is important to have an adequate attic exhaust area, which is often overlooked and be sure to select a qualified installer for your Triangle Whole House Fan System, to ensure that the energy-saving equipment is installed correctly.


Efficient and Economical Solutions to Home Cooling

Having a properly cooled home will never go out of style, and Lakewood-based Colorado Home Cooling keeps homeowners on-trend. CHC is a small, locally-owned and operated business that has been an authorized Triangle Engineering Dealer since 2003. Owner and founder, Ryan Starr uses his team’s collective expertise in efficient and economical solutions to home-cooling and ventilation that can help you choose the air mover that fits your needs.

I install Triangle Engingeering whole house fans because they are powerful, quiet and durable. My customers enjoy the quiet performance and considerable energy savings. Whole house fans are the best cooling solution for high elevation climates.

Ryan Starr, Founder/Owner Colorado Home Cooling

Starr started working in the whole house fan industry in 1992. In 2003, he launched Colorado Home Cooling to address the cooling needs of Denver’s growing population and became a proud dealer of Triangle Engineering’s Comfort Cooler fans. Starr has built a customer-first business that provides comprehensive home cooling solutions. CHC has installed thousands of Triangle Engineering fans for happy customers all over the Denver-Metro area for over 15 years. Go to to learn more about home cooling solutions that include whole house fan energy-saving equipment.

Proudly made in the USA, Triangle’s Whole House Fans are an efficient, fast, economical way to cool your home. Click here to learn more about Triangle Engineering’s Comfort Cooler and Comfort Aide whole-house fans.

Spotlight: Karmen’s Garden & Greenhouse

Karmen’s Garden and Greenhouse, based in Grass Valley, California, offers custom greenhouses that feature exhaust fan kits manufactured by Triangle Engineering. Each greenhouse is customized to fit specific plant needs. Both structurally sound and built for the elements, these greenhouses are built to last for countless growing seasons. A greenhouse takes considerable preparation and design knowledge to meet specific growing needs. 

Triangle Engineering’s combination of durability, airflow, and energy efficiency have led to many successful installations. The VIK series is the perfect choice for optimal ventilation in a greenhouse or any commercial or industrial building.

Brian Radcliff, Karmen’s Garden & Greenhouse, Grass Valley, California

Custom made-in-the-USA greenhouses

The experts at Karmen’s Garden and Greenhouses believe that the climate control achieved with Triangle’s VIK Series belt drive exhaust fans is a major contributor to a successful harvest. Visit to learn more about custom made-in-the-USA greenhouses.

Ships fully assembled and ready to install

All VIK series fans come standard with installed shutters for protection against weather and corrosion and OSHA-compliant safety guards. VIK fans are available with blade diameters from 24” to 60”. ODP and TEFC are 1/2HP – 5HP motors.

Parker Ionics VARI-FLO Series Powder Coating Booth

Parker Ionics VARI-FLO at Triangle Engineering

Triangle Engineering doesn’t paint by number, we paint by powder. Triangle Engineering is proud to utilize the Parker Ionics VARI-FLO Series Powder Coating Booth, an automated solution for powder-coating, on our production line.

Looks better. Lasts longer.

Powder coating is a finishing method that not only lengthens the lifespan of a product, it also greatly improves the appearance. Products are more durable with the polishing touch powder coating delivers-—something that spray or wet coating cannot quite achieve.

Just say no to HAP and VOC!

Lower in cost and less wasteful, powder coating is better for the environment, too. Our automated booth requires no hazardous air pollutants (HAP) and releases no volatile organic compounds (VOC).

Let’s talk color!

Steel Blue vs. Cobalt Blue

Bronze is out, and navy blue is in. We are changing the barrel color of our hardworking Heatbuster Series. We are still testing out the perfect hue for our top-of-the-line portable floor fans. Stay tuned for the unveiling!

We currently offer custom colors for many of our fan series. If your application requires a special color, contact us for an estimate. Quantity requirements and upgrade fees may apply.

Agri-Control Technologies & Triangle Engineering

A vegetable of note, the sweet potato, requires ample time to ripen to allow starches to convert to sugar. This ripening process requires dry storage in a well-ventilated place where the temperature is monitored and controlled. In some instances, sweet potatoes may be stored for up to one year in the commercial vegetable industry— that is where Agri-Control Technologies comes into scope.

Energy Efficient Vegetable Storage Ventilation

For over 25 years, Agri-Control Technologies has been the front-runner in the vegetable industry and the air ventilation world. Energy efficiency is an industry must and Agri-Control Technologies knows the ins and outs. Parent company BTU Ventilation offers low energy consumption E-Coolers that are maintenance-free with a long life. BTU Ventilation has combined today’s technology with time-proven practices to become the leader in vegetable storage ventilation, and they are also putting that to use for the emerging beekeeping industry. 

Triangle Engineering’s equipment has been used for many years by sweet potato growers. Their availability is good, especially for last minute orders, due to their ample stock. Recently, we’ve also see the same or similar ventilation equipment used by beekeepers as a vital part of smart bee storage systems to protect pollinators in the winter.

Robert Drozdowski, Agri-Control Technologies

Drozdowski credits the quick ship availability and superior quality of Triangle Engineering’s products to high customer satisfaction and a superior end product. 

Use Natural Ventilation To Enhance Comfort

Ventilation is an aspect of metal buildings that is often overlooked. A metal building can be kept more comfortable than you think using a combination of natural ventilation and mechanical cooling methods. Natural ventilation is a form of passive cooling that is sustainable and is achieved by placement and orientation of a building to catch prevailing winds to increase airflow. Other passive cooling techniques include night flushing, which utilizes the lower temperatures of night air to pre-cool a building for the next day, and comfort ventilating, which is done day or night to promote evaporation. The performance of passive cooling is a function of how dry or humid the climate is and impacts the effectiveness of any natural ventilation strategy.

Future Metal Buildings Blogspot

Catch Prevailing Winds To Create Natural Comfort

Airflow over a building creates a positive pressure zone on the upstream side. Locate intake areas of your metal building to take advantage of the positive pressure zone produced by the prevailing winds. Another benefit of natural cooling is that with increased wind speed, the air simply feels cooler.

Best practices for optimizing both natural cooling and mechanical cooling

The flip-side of natural ventilation is mechanical cooling, something Triangle Engineering has been refining since 1948. We offer many air moving solutions from wall and ceiling-mounted fans to portable spot coolers. We can help in the proper placement of fans within your metal building

  • Position building and locate intake areas to take advantage of prevailing winds
  • Do not locate fans blowing opposite of each other
  • Arrange fans to blow in the same direction and utilize the inertia in the airstream

Passive Cooling with Prevailing Winds: Building Placement Matters

The positioning of metal buildings should be carefully considered to catch prevailing winds, which can make a significant difference in ventilation and cooling when used in conjunction with the right industrial fan systems. When mechanical cooling is needed, put Triangle’s tough and reliable air movers to work.

As a general rule of thumb, prevailing winds blow west to east rather than north to south in North America. Geological formations like mountains, valleys, and bodies of water also play an important role. For example, the south slope of a hill has shorter shadows and receives more direct solar heat. If you are interested in knowing the prevailing wind direction for your area in real-time? Visit to view a live map— it’s mesmerizing.