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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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PFG Direct Drive Agricultural Exhaust Fans

QUALITYProducts.
SINCE 1948.

PFG Direct Drive Agricultural Exhaust Fans

Triangle Engineering’s PFG Series direct-drive agricultural exhaust fans deliver reliable, steady airflow in a tough, farm-ready package. Built for daily duty in barns, greenhouses, and crop storage, each unit features a heavy-gauge galvanized wall box, frame, and blade; a rolled inlet venturi for smoother airflow; TEAO motors for dusty/humid environments; and a direct-drive propeller—no belts or pulleys—so there’s no belt slip or sheave losses and far less to service.

Available in 36″, 42″, and 48″ diameters, PFG direct-drive fans offer flexible power options (230V single-phase; 230/460V three-phase) and ship fully assembled and factory-tested for quick field installation. Many standard models are stocked for quick shipment from our Arkansas facility, and every unit is Made in the USA (with a mix of domestic and foreign components) and supported by readily available, in-stock replacement parts.

Backed by over 70 years of American manufacturing expertise, the PFG direct-drive series combines durability, low maintenance, and dependable airflow—providing a practical agricultural exhaust solution for poultry, swine, dairy, greenhouses, and produce storage.

  • Heavy-gauge galvanized construction
    Corrosion-resistant wall box, frame, and blade stand up to moisture, ammonia, and daily washdowns—built for long service life in barns, greenhouses, and storage rooms.

  • Rolled inlet venturi
    Aerodynamic inlet reduces turbulence and pressure loss for smoother, more efficient airflow through the fan opening.

  • Dual-side bird screens
    Galvanized welded screens on intake and discharge help keep debris and pests out while protecting moving components.

  • Low-maintenance direct drive
    No belts or pulleys—fewer wear parts, no belt slip, and no sheave/friction losses. You get consistent output over time and lower lifetime maintenance.

  • Factory-balanced propeller & vibration-isolated bearings
    Direct drive precision-balanced propeller minimizes vibration and mechanical noise for smoother, more dependable operation.

  • Ships fully assembled & tested
    Arrives ready for quick field installation—shorter install windows mean less downtime for your operation.

  • TEAO motors built for ag
    Totally Enclosed Air Over motors are designed for dusty/humid environments common to livestock and horticulture, supporting reliable, continuous duty.

  • Flexible power, simple retrofits
    Standard 230V single-phase (115V consult factory) and 230/460V three-phase options make upgrades and replacements straightforward across facilities.

  • Right size for the job
    36″, 42″, and 48″ diameters let you match airflow and static pressure to your building design (typical rating points 0.00″–0.10″ w.g.).

  • Made in the USA + parts on hand
    Manufactured in the USA (with a mix of domestic and foreign components) and supported by readily available, in-stock replacement parts—many standard models are stocked for quick shipment.

  • Built for agriculture’s daily demands
    From poultry and swine to dairy, greenhouses, and produce storage, the PFG direct-drive line delivers durable, dependable agricultural exhaust with low maintenance and reliable uptime.

Sizes & models (36″–48″)

  • Standard diameters: 36″, 42″, 48″

  • Use cases: agricultural exhaust for livestock facilities, greenhouses, and crop/produce storage

  • Selection: direct-drive architecture for low maintenance and consistent output (no belts or pulleys)

Construction & finish

  • Rugged galvanized build: heavy-gauge galvanized wall box, frame, and blade for corrosion resistance in demanding ag environments

  • Aerodynamic inlet: rolled inlet venturi to reduce turbulence and improve airflow efficiency

  • Dual-side protection: galvanized welded bird screen, front and back

  • Low-maintenance drive: direct-drive hub for fewer wear parts and reliable, repeatable performance

  • Finish & readiness: galvanized steel construction; ships fully assembled and factory-tested for quick field installation

  • Origin & support: Made in the USA (with a mix of domestic and foreign components) with readily available, in-stock replacement parts

Motor types, voltages & horsepower range

  • Motor type: Totally Enclosed Air Over (TEAO), suitable for dusty/humid agricultural settings

  • Standard voltages:

    • Single-phase: 230 V (consult factory for 115 V options)

    • Three-phase: 230/460 V

  • Motor HP range: 1/2 HP and 1 HP (by diameter/model)

Operating range

  • Static pressure selection: fans are rated at common agricultural SP points (e.g., 0.00″–0.10″ w.g.). Select per your building design SP and required CFM

  • Ambient temperature: standard TE motors for typical ag environments; contact us for high-ambient, hazardous-location, or other special-duty requirements

Round out your PFG direct-drive install with add-ons that improve control, protect against weather, and keep airflow consistent. All accessories are sized to match your fan for a clean fit.

Shutters and Dampers – Cut back-drafts and weather intrusion when fans are off. Rigid, ag-grade blades sized to each PFG diameter for fast, tidy installs

Rain hoods – Shield the opening from rain and wind without choking airflow. Flanged, all-weather hoods mount quickly on exposed walls.

Thermostats – Automatic, temperature-based staging for steady conditions and energy savings. Simple wiring for standard 230V single-phase (ask about 115V/3-phase).

PFG direct-drive agricultural exhaust fans remove heat, humidity, and contaminants across livestock and horticulture, delivering consistent output with minimal maintenance (no belts to adjust or replace).

Poultry houses (broiler, breeder, layer)

  • Sidewall or end-wall exhaust for cross or tunnel ventilation.

  • No belt slip means steady airflow over long grow-outs; quieter operation helps reduce stress.

  • Pair with shutters and thermostats for staged, seasonal control.

Swine barns (farrowing, nursery, finishing)

  • Negative-pressure exhaust to pull fresh air through ceiling or wall inlets.

  • Low-maintenance drive reduces service time; steady CFM supports precise controller setpoints.

  • Galvanized build handles corrosive, high-ammonia environments.

Dairy & beef (freestall, holding pens, parlors)

  • Exhausts warm, humid air to support cow comfort and air quality.

  • Direct-drive reliability = consistent performance during continuous duty; lower vibration around parlors.

  • Ships ready for fast install during retrofits or expansions.

Greenhouses & nurseries

  • End-wall exhaust to regulate temperature and humidity.

  • Set-and-forget operation with steady airflow supports environmental control strategies.

  • Add rain hoods on exposed walls; stage with simple thermostats.

Crop & produce storage (potato, onion, seed)

  • Removes warm, moist air to reduce condensation and spoilage risk.

  • Consistent CFM over time (no belt degradation) helps maintain storage setpoints.

  • All-galvanized construction endures cool, damp conditions.

Equipment, pack, and utility rooms

  • General exhaust for fumes and process heat.

  • TEAO motors thrive in dusty, humid spaces common on farms.

  • Clean, bolt-on fit with shutters for tight pressure control.

  • Less to service, more to trust
    No belts or pulleys, fewer wear parts, no tension checks, and no belt slip. That means steady airflow and lower lifetime maintenance.

  • Performance that holds
    With no sheave/friction losses, RPM stays consistent, helping you maintain target static pressure and predictable controller response over time.

  • Smoother, quieter operation
    Factory-balanced propeller reduces vibration and mechanical noise around animals, plants, and people.

  • Built for harsh ag environments
    Heavy-gauge galvanized wall box, frame, and blade with dual-side bird screens and TEAO motors for dusty, humid spaces.

  • Fast install, fast uptime
    Ships fully assembled and factory-tested for quick field installation during builds, retrofits, or emergency replacements.

  • Retrofit-friendly power
    Standard 230V single-phase (ask about 115V) and 230/460V three-phase options make upgrades straightforward across facilities.

  • Right-sized simplicity
    Three core diameters—36″, 42″, 48″—cover common ag exhaust needs without over-spec’ing or over-maintaining.

  • In stock & supported
    Many standard models are stocked for quick shipment from Arkansas, with readily available replacement parts to keep you running.

  • Made in the USA
    Manufactured in the USA with a mix of domestic and foreign components, backed by decades of Triangle Engineering know-how.

Details

  • Rugged heavy gauge galvanized housing, frame and blade
  • Galvanized welded bird screen on both front and back
  • Rolled inlet venturi for efficient air flow
  • Totally enclosed motor
  • Single-phase fans are factory wired 230 volt and provided with a power cord with molded plug
  • Three-phase models available
  • Belt drive fans are equipped with Triangle’s “X-Wing” low maintenance belt tensioner, which extends the life of the belt and motor
  • Consult factory for 115V models

See full specifications for sizing and performance data

View Full Specs