QUALITYProducts.
SINCE 1948.

Since 1948, Triangle Engineering has specialized in dependable ventilation solutions built for demanding environments. The FHIR Series is our premier true reversible wall fan line, engineered to handle both supply and exhaust needs from a single unit—without sacrificing performance in either direction. By combining symmetrical cast aluminum airfoil blades with a fully bi-directional venturi, the FHIR Series delivers consistent airflow and efficiency whether you’re drawing fresh air in or expelling stale air out.

Made in the USA with a blend of domestic and foreign components, the FHIR Series is built for long-lasting reliability and performance.

Key Features & Benefits

True Reversible Performance

• Bidirectional Venturi: Unlike typical “reversible” fans that lose efficiency when reversed, our venturi is engineered for equal airflow in both directions.
• Symmetrical Airfoil Blades: Each cast aluminum blade is designed to move air with minimal drag and no loss of performance, ensuring near-identical CFM whether supplying or exhausting.
• Totally Enclosed Motor (TE): Keeps dust and debris out for longer service life. Our motor design is optimized for smooth, reliable reversibility.

Built to Last

• Welded Construction: The rugged, industrial-grade housing is made from galvanized steel to resist corrosion, ideal for harsh conditions in factories, warehouses, and agricultural settings.
• Polyester Powder-Coated Venturi Panel: Added protection against rust and wear, ensuring your fan stays in top shape year after year.
• Belt-Drive or Direct-Drive: Choose the configuration that fits your application. Belt-drive models come standard with pillow block bearings for smooth operation.

Ready for Quick Installation

• Galvanized Wall Housing (Standard): Simplifies mounting and saves time—no extra framing required.
• Reversing Switch Included: Every FHIR fan equipped with a totally enclosed motor ships with a reversing switch (field installed), allowing for seamless airflow direction changes once installed.
• Maintenance Friendly: All components—motor, belts, bearings—are readily accessible for straightforward service or inspections.

Wide Range of Configurations

• Blade Sizes: 30″, 36″, and 48″ to accommodate a variety of facility sizes.
• Horsepower Options: Available in 1, 2, or 3 hp models (contact us for additional motor requirements).
• Voltage Flexibility: Standard single-phase (115V, 230V) and three-phase (230V, 460V) configurations. Additional options include 277V, 208V, 415V, and 575V to fit specialized applications.

Technical Specifications

• Fan Type: True Reversible Industrial Wall Fan (Supply & Exhaust)
• Drive Options:
  • Belt Drive (with pillow block bearings for smooth operation and easy tension adjustments)
  • Direct Drive (low-maintenance design)
• Blade Diameters: 30″, 36″, 48″
• Horsepower Range: 1 hp, 2 hp, 3 hp
• Motor Enclosure: Totally Enclosed (TE) motor for durability in dusty or moist environments
• Venturi Design: Bi-directional, polyester powder-coated steel construction
• Impeller: True symmetrical cast aluminum airfoil blades
• Voltage: Single-phase (115V, 230V), Three-phase (230V, 460V), optional (277V, 208V, 415V, 575V)
• Switch: A reversing switch (field install) ships with all models equipped with a totally enclosed motor
• Construction: Galvanized wall housing and polyester powder-coated venturi
• Mounting: Wall mount with included galvanized housing
• Performance Data: Airflow capacities range from approximately 5,500 CFM up to 28,300 CFM. For detailed performance at various static pressures, see the Triangle Engineering product catalog.

Customization Options

At Triangle Engineering, we understand that no two ventilation needs are exactly alike. That’s why we offer a range of customization options for the FHIR Series to ensure the perfect fit for your application:

• Custom Voltage & Motor Options: Need a different voltage or motor configuration? We can accommodate a variety of power requirements beyond our standard offerings.
• Alternative Coatings & Finishes: For environments with high humidity, corrosive chemicals, or extreme temperatures, we offer specialized coatings to enhance durability.
• Mounting & Installation Modifications: Whether you need a unique mounting solution or additional accessories for installation, we can provide modifications tailored to your facility.
• Specialized Control Integration: Integrate with variable frequency drives (VFDs) or building management systems (BMS) for automated and energy-efficient operation.
• Custom Airflow & Performance Adjustments: If your application requires a specific airflow range or static pressure handling, our engineering team can design a solution that meets your needs.

Contact us today to discuss how we can customize the FHIR Series to optimize your ventilation system.

Why the FHIR Series?

1. No Performance Compromise
   The combination of a true bidirectional venturi and symmetrical airfoil blades ensures consistent airflow capacity in both forward and reverse modes—unlike traditional reversible fans that can experience significant drops in CFM.
2. Industrial-Grade Durability
   From welded construction and galvanized finishes to totally enclosed motors, the FHIR Series stands up to demanding environments—day in, day out.
3. Time & Cost Savings
   One fan for both intake and exhaust cuts down on equipment expenditures, reduces installation complexity, and simplifies maintenance schedules.
4. Plug-and-Play Reversibility
   A reversing switch (included, field install) and a robust motor design let you toggle airflow direction quickly, adapting your ventilation strategy to any condition.
5. Trusted Since 1948
   Backed by Triangle Engineering’s decades-long heritage of quality and innovation, every FHIR Series fan is factory-tested and supported by a knowledgeable customer service team.

The Importance of True Reversible Ventilation

Effective ventilation isn’t just about removing stale or hot air—it’s about flexibility. With the FHIR Series, you can seamlessly switch from exhaust to intake without the performance drop-offs typical of “reversible” fans that simply reverse motor rotation. This true reversible design helps facilities:

• Control Internal Temperatures by bringing in cooler outdoor air during off-peak hours.
• Promote Healthier Air Quality by flushing out contaminants and quickly replenishing fresh air.
• Reduce Equipment Costs by eliminating the need for separate intake and exhaust fans.

Optional Accessories

• Shutters or Louvers: Prevent unwanted backdrafts and protect the fan opening from weather.
• Protective Guards: For added safety around moving parts.
• Rainhoods: Shield the external opening from rain, snow, or wind-driven debris.
• Speed Controllers / VFDs: Automate speed adjustments for energy savings and integration with building management systems.

Why Choose Triangle Engineering?

For over 75 years, Triangle Engineering has been a trusted name in industrial ventilation. Our commitment to quality, durability, and performance sets us apart. Here’s why customers continue to choose us:

• Proven Reliability: Our fans are built to last in the most demanding environments, from manufacturing plants to agricultural facilities.
• Precision Engineering: We design our products to deliver maximum efficiency and airflow, ensuring optimal ventilation performance.
• Customer-Focused Solutions: We work closely with our clients to provide customized ventilation solutions tailored to their specific needs.
• Made in the USA: Proudly engineered and assembled in the United States with a blend of domestic and foreign components.
• Exceptional Support: Our knowledgeable team is here to assist with product selection, customization, and technical support.

Get Your FHIR Series Fan Today

Triangle Engineering: Solutions you can trust since 1948.