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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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QBD Series – Economy Line Direct Drive Barrel Fan

QUALITYProducts.
SINCE 1948.

QBD Series – Economy Line Direct Drive Barrel Fan

Triangle Engineering’s QBD Series is our economy line of direct drive portable barrel fans, delivering reliable airflow at an affordable price. Built with a rugged steel barrel, OSHA-compliant spiral-wound guards, and deep-pitch blades, the QBD provides steady, economical cooling in shops, warehouses, and agricultural facilities without the short life cycle of disposable imports.

Available in 36″ and 42″ diameters, each unit uses a ½ HP, two-speed motor to move up to 13,200 CFM for dependable people and equipment cooling. Designed for mobility, the QBD rolls easily into position with no-flat wheels and a rear handle. Unlike throwaway fans, every QBD model is fully supported with readily available replacement parts—motors, guards, blades, wheels and switches—for quick shipment and years of continued use.

  • Economy line design – value-focused without sacrificing durability.

  • Economical cooling – two-speed motor balances performance and efficiency.

  • Direct drive simplicity – no belts or pulleys to service.

  • Deep-pitch steel blades – high-volume airflow up to 13,200 CFM.

  • Durable steel barrel with OSHA spiral-wound guards – strength and safety combined.

  • Portable mobility – tilt-back frame with two wheels for easy transport.

  • Service made easy – stocked replacement parts ship quickly to minimize downtime.

  • Models: QBD3623 (36″), QBD4223 (42″)

  • Airflow: 10,900 / 8,800 CFM (36″); 13,200 / 10,200 CFM (42″)

  • Motor horsepower: ½ HP

  • Motor speed: Two-speed

  • Amps: 6.1 A

  • Power: 115 V single-phase, cord & molded plug

  • Dimensions:

    • 36″: 39″ W × 21″ D × 40″ H – 96 lbs

    • 42″: 45″ W × 21″ D × 45″ H – 101 lbs

  • Safety: OSHA-compliant front and rear guards

  • Personnel cooling in shops and warehouses

  • Assembly lines and light manufacturing areas

  • Agricultural barns and equipment sheds

  • Auto service bays and body shops

  • Temporary cooling
  • Economy line, not disposable – affordable fans that are built to last.

  • Parts support guaranteed – stocked motors, blades, guards, wheels and switches for fast replacement.

  • Durable by design – rugged steel construction holds up to everyday use.

  • Reliable airflow – deep-pitch blades move serious air for people or equipment cooling.

  • Quick and simple operation – roll into place, plug in, and choose your speed.

Fabricated, assembled, and performance-tested in Jacksonville, Arkansas, using a blend of domestic and globally sourced components—backed by Triangle Engineering’s decades of ventilation expertise and fast parts support.

Details

  • Economical cooling
  • Durable steel barrel
  • Two-speed

See full specifications for sizing and performance data

View Full Specs