QUALITYProducts.
SINCE 1948.

• All-welded steel construction
  All welded hood assembly and air shaft combined with a fully welded fan frame—fabricated from heavy-gauge steel—shrug off vibration and roof movement for trouble-free service.
• Belt-drive flexibility
  Slower blade speeds cut noise and wear, while interchangeable sheaves (or a VFD-ready motor) let you fine-tune CFM and static pressure without swapping the fan or motor.
• High-efficiency air-foil propellers
  Precision-balanced cast-aluminum blades deliver high volumes of air with minimal turbulence, preventing motor overload and keeping sound levels low.
• Heavy-duty drivetrain & bearings
  Self-aligning air handling quality pillow-block ball bearings, taper-lock cast-iron sheaves, and oversized V-belts are sized for continuous industrial duty and long service intervals.
• 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.
• Multiple motor options
  Choose standard Totally Enclosed (TE) or Hazardous Location (HL) motors, or upgrade to chemical-duty, 50 Hz, arctic-duty, high-ambient, IEEE 841, or ECM packages to match any environment or energy goal.
• Rugged weather protection
  Heavy gauge steel with a polyester powder-coat finish keeps the fan performing in all climates.
• Service-friendly design options
  Optional disconnect switch, access doors, and extended lubrication lines make routine inspections quick and safe—no hood removal required.
• Proven heritage
  Backed by 70+ years of Triangle Engineering expertise, the HHC Series Belt-Drive Hooded Roof fans have thousands of installations that have outlasted roof systems and production lines alike.

Sizes & Models (24″–60″)

• Standard Blade Diameters: 24″, 30″, 36″, 42″, 48″, 54″, 60″
  (Consult factory for larger diameters)
• Airflow Range: up to 86,000+ CFM (Need higher airflow? Contact us to discuss custom configurations.)
• High-efficiency cast aluminum non-overloading airfoil propellers for optimum performance

Standard Motor Types, Voltages & Horsepower Range

• Standard Motor Options: Totally Enclosed (TE), Hazardous Location (HL)
• Non-Standard: Open Drip Proof, 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)

• Horsepower Offerings: 1/2 HP, 3/4 HP, 1 HP, 1-1/2 HP, 2 HP, 3 HP, 5 HP, 7-1/2 HP, 10 HP, 15 HP (contact us for higher horsepower requirements)
• Motor Control: Consult factory for motor compatibility with Variable Frequency Drives (VFD’s)

Operating Range

• Temperature: Handles up to 110°F (contact us for higher-temp motors)
• Static Pressure: Up to 1.00” w.g. depending on model. Refer to performance tables for model-specific capabilities. (consult factory for higher static pressure requirements)

Construction & Finish

• Housing: Heavy-gauge, all-welded steel for structural integrity
• Belt-drive featuring:
  • Heavy-duty air handling quality pillow block bearings
  • Precision-balanced cast iron sheaves
• Polyester Powder Coat Finish: Resists corrosion, extends product life
• Heavy-gauge hood: ships as a single welded assembly
• Motor in Airstream: Simplifies servicing and inspection

Fine-tune your HHC belt-drive hooded roof exhaust fan for site-specific codes, climates, and maintenance protocols with these factory-engineered upgrades:

• Disconnect switches – A pre-wired, UL-listed NEMA 3R or 4X safety switch mounts on the curb base, giving you a lock-out/tag-out point within sight and sound of the motor for NEC-compliant service.
• Louvers / backdraft dampers – Gravity- or motor-operated assemblies that close when the fan is off, blocking rain, wind-driven snow, and negative-pressure backflow. Essential for conditioned or pressurized buildings.
• Adjustable drives – Alternate sheave sets (or open-face variable-pitch sheaves) let you dial in RPM to meet precise CFM/ SP targets or compensate for future process changes—without replacing the motor.
• Access doors – Gasketed panels built into the hood provide easy entry to belts, bearings, and propeller for inspection and cleaning, reducing downtime.
• Filters – Washable aluminum-mesh fitted in the hood for supply-air units—capture lint, leaves and dirt before it reaches the workspace.
• Bird screens – Welded, galvanized wire mesh installed at the hood outlet or intake keeps birds and large debris out of the airstream while preserving airflow.
• Extended lubrication lines – Remote grease lines routed from pillow-block bearings to an exterior port, allowing safe, roof-level relubrication without removing the hood.
• Special Coatings – Epoxy or marine-grade powder coats add extra corrosion resistance for coastal, chemical, or food-processing roofs; color-match options support corporate branding.

Need something not listed? Triangle’s engineering team can integrate custom accessories into your HHC fan at the factory—keeping your project on spec and on schedule.

HHC belt-drive hooded roof fans keep large industrial spaces cool, compliant, and productive by quietly moving huge air volumes while shielding the drive train from weather. From heat-laden production halls to high-density server farms, the HHC’s rugged construction and belt-drive flexibility make it a go-to solution wherever reliable rooftop airflow is mission-critical.

• Manufacturing Plants: Exhaust hot process air, welding fumes, and airborne particulates to maintain safe working conditions.

• Warehousing & Distribution Centers: Exchange stale air in cavernous buildings, helping regulate temperature stratification and occupant comfort.

• Foundries & Metalworking Shops: Vent smoke, molten-metal heat, and dust generated by casting, forging, or grinding operations.

• Chemical Processing Facilities: Remove corrosive vapors and maintain negative pressure to protect personnel and sensitive equipment.

• Beverage & Food Processing Plants: Control humidity, odors, and wash-down moisture while meeting stringent sanitation requirements.

• Crypto-Mining Farms: Expel the immense waste heat produced by densely packed ASIC rigs or GPU clusters, safeguarding uptime.

• Power & Utility Rooms: Provide steady rooftop exhaust or make-up air to cool switchgear, transformers, and backup generators.

• Pulp & Paper Mills: Mitigate steam, chemical fumes, and high ambient temperatures common in pulp digesters and paper machines.

• Quiet, low-vibration operation
  Slower RPMs and precision-balanced air-foil blades cut sound at its source, helping you meet plant noise limits while extending bearing life.
• Maintenance made easy
  Factory options such as hinged access doors, extended grease lines, pre-wired disconnects, variable-pitch sheaves, and custom coatings let us tailor each HHC to your airflow, environment, and maintenance program—so the fan meets your exact needs while routine service stays fast and safe.
• Built in the USA for fast turnaround
  Fabricated, balanced, and run-tested in our Arkansas plant, with motors and hardware that let us ship out quickly.
• Rugged, all-welded construction
  Heavy-gauge steel hoods, cast-aluminum propellers, and industrial-grade bearings designed for continuous duty.
• Seven decades of field-proven reliability
  Since 1948, Triangle Engineering fans have logged millions of service hours in manufacturing, power, and process facilities across North America—so you can specify with confidence.

Complement or extend your ventilation system with these premium solutions:

• JD Series Direct Drive Roof Mount Exhaust Fan
  • Ideal for general ventilation where the motor can be positioned in the air stream for effective cooling.
• JBI Series Belt Drive Roof Mount Exhaust Fan (motor inside airstream)
  • Ideal for general ventilation where the motor can be positioned in the air stream for effective cooling
• JBX Series Belt Drive Roof Mount Exhaust Fan (motor out of airstream)
  • Keeps the motor separate from harsh or contaminated airflows, extending motor life.
• FHI Series Panel Exhaust or Supply Fan
  • Severe duty panel exhaust or supply fan, available in direct drive or belt drive configuration and designed for harsh environments
• 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.

All HHC Series belt-drive hooded roof fans are proudly manufactured in the USA with a blend of domestic and foreign components, reflecting our commitment to quality, reliability, and continuous improvement.

Every site has its own airflow targets, space constraints, and environmental hazards. Triangle Engineering’s in-house design team can adapt the HHC Series, or any of our roof fans, to meet your needs. From a minor tweak to a ground-up redesign, we build and test custom units at our Arkansas plant, delivering on the same quick timeline you expect from our standard line.

What we can customize

• Performance tuning
  • Airflow & static-pressure targets – Alternate sheaves, propeller pitches, or full blade swaps to meet a precise duty point.
  • High-temperature / arctic duty – Motors, bearings, and lubricants rated for 160 °F or –40 °F, with propeller adjustments for density changes.
• Motor & drive packages
  Explosion-proof, two-speed, VFD-rated, ECM, IEEE 841, 50 Hz, or special horsepower selections—pre-wired and run-tested at the factory.
• Materials & coatings
  All-aluminum or stainless-steel construction for corrosive atmospheres; epoxy, or food-grade powder coats; color-matched corporate finishes.
• Special features
  Symmetrical air-foil blades for true reversible flow, pre-wired disconnects, filters, bug screen or pre-installed sensors and controls.

How the process works

1. Define the challenge – Send us your airflow spec, temperature range, layout sketch, or corrosion concern.
2. 2. Refine the design together – Our engineers walk through your airflow targets, material choices, drive options, and installation constraints, then send a submittal package for your approval.
3. Prototype & test – Each custom HHC is fabricated, balanced, and run-tested on our Arkansas line—no outsourcing, no schedule surprises.
4. Ship on your timeline – Domestic production and stocked components keep lead times short—even on bespoke builds.

Have a spec that doesn’t fit an off-the-shelf fan? Call 501-982-7558 or email us. We’ll turn your requirements into a roof-ready HHC solution that matches your requirements.