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Sizing & Airflow Guide
How to Select the Right Fan Diameter and Layout for Your Facility
HVLS fan sizing starts by finding out where most of the people spend most of their time and taking a measurement of that space. Then consider the direct breeze region of each fan size. As a rule of thumb, each fan will produce a 3 to 5 mph breeze in a space equal to 3 to 4 times its diameter, depending on the size and number of obstructions present.
If employees spend most of their day in a space 80 feet across, the optimal solution is a single 20 foot fan positioned roughly in the center of that space.
Size each fan by its direct breeze region. The direct breeze region applies to operation at half of maximum speed with a clear floor. A 3 to 5 mph breeze can reduce apparent temperature by as much as 10°F.
| Model | Diameter | Direct breeze region | CFM | Maximum RPM | Minimum airfoil clearance |
|---|---|---|---|---|---|
| HF800 | 8 ft | 28 to 32 ft diameter | 15,899 | 44 | Sides 2 ft, ceiling 3 to 4 ft |
| HF1200 | 12 ft | 42 to 48 ft diameter | 48,759 | 44 | Sides 2 ft, ceiling 3 to 4 ft |
| HF1600 | 16 ft | 56 to 64 ft diameter | 92,298 | 44 | Sides 2 ft, ceiling 3 to 4 ft |
| HF20 | 20 ft | 70 to 80 ft diameter | 233,605 | 49 | Sides 2 ft, ceiling 4 to 6 ft |
| HF24 | 24 ft | 90 to 100 ft diameter | 259,438 | 62 | Sides 2 ft, ceiling 6 to 8 ft |
| E6 10 Foot | 10 ft | 38 to 42 ft diameter | 25,488 | 44 | Sides 2 ft, ceiling 3 to 4 ft |
| E6 12 Foot | 12 ft | 42 to 48 ft diameter | 36,190 | 44 | Sides 2 ft, ceiling 3 to 4 ft |
| E6 16 Foot | 16 ft | 56 to 64 ft diameter | 87,461 | 44 | Sides 2 ft, ceiling 3 to 4 ft |
| E6 20 Foot | 20 ft | 70 to 80 ft diameter | 197,178 | 49 | Sides 2 ft, ceiling 4 to 6 ft |
CFM is tested according to ANSI/AMCA Standard 230-15. HF Series fans have 8 airfoils and come in brushed aluminum, white, black, red, yellow or blue. Essential 6 Series fans have 6 airfoils and come in black only.
Install each fan so that it meets the OSHA standard that the blades are a minimum of 10 feet from floor level. Any obstruction must be 2 feet or more, horizontally, from the tips of the blades, and each fan must meet its minimum clearance to the ceiling deck.
Minimum airfoil clearance to the ceiling: 3 to 4 ft.
Minimum airfoil clearance to the ceiling: 4 to 6 ft.
Minimum airfoil clearance to the ceiling: 6 to 8 ft.
The standard mount fits I-beam, Z-purlins or open joist. Mounting extensions are available in 1, 2, 3 and 6 foot kits, with modifications to order. The beam mounting kit clamps to a flange between 7 and 15 inches wide and adjusts for angles up to 30 degrees from horizontal, so the motor and extension stay vertical and the blades stay parallel to the floor.
Before installing any fan, consult and verify with a structural engineer that the existing structure can support the loads of the fan. The mounting must be secure enough to absorb 250 ft lb of torque, plus an appropriate safety factor.
Fans must be installed in areas free of obstructions such as light fixtures, sprinklers, overhead piping, HVAC equipment, crane systems, and conduit and wiring. Keep the path of the blades away from the direction of local lighting. Multiple light sources dramatically reduce the shadow cast by lights positioned above the blades.
If you are installing more than one fan near each other, each fan must be installed no less than 2.5 times the fan diameter apart.
Avoid blocking airflow to the areas where people will benefit from it. That can mean moving obstructions or changing their orientation to take full advantage of the airflow.
Every fan runs on a VFD that is infinitely adjustable in speed, so there are no big jumps in airspeed as there are with standard ceiling fans.
In summer, run the fan at the highest speed that balances comfort with the airspeed the work environment can tolerate. In a building with air conditioning, the fans let you leave the system at a higher set point without compromising comfort, and savings can be as much as 6 percent per degree.
In winter, run the fan just below the speed that produces a noticeable breeze, with the speed set to 5 to 15 percent. If a cold draft is a concern, turn up the speed until you feel the breeze, then turn it down slightly. You get the benefits of destratification without the chill.
Humongous Fan made the deliberate design choice not to implement reverse rotation. The blades use a twist and taper: the end of a ten foot blade moves 10 times faster than its base, so the blade has a deeper angle of attack where it moves slower. That shape is what lets a lighter fan move more air at a lower RPM with lower horsepower.
Overheating means lost productivity. At an apparent 80°F, productivity loss is 3.77 percent. At 90°F it is 12.60 percent, and at 100°F it is 20.23 percent.
The fans lower the apparent temperature for the people under them, which allows the air conditioning to run at a higher set point without compromising comfort.
For temperature sensitive products on tall shelving, the solution will use fewer fans running faster if airspeed is not a problem, and a larger number of fans if airspeeds must be kept low. To keep employees comfortable while cutting costs, place the fewest number of the largest possible fans above the spaces where most of the people spend most of their time, and redirect heated air from the ceiling directly to the people below.
By circulating and destratifying climate controlled air, HVLS fans can reduce HVAC air intake, which means lower operating costs, stable indoor air quality and reduced maintenance.
The fans are designed for indoor use and should not be subject to direct, high winds. In an open sided structure such as a barn, or indoors near another air supply, a fan may need to be restrained externally. Call the factory for help.
Sound measured directly beneath the fan at three quarter speed in an active work environment is under 57 dBA for the 8, 10, 12 and 16 foot fans and under 59 dBA for the 20 and 24 foot fans.
| Model | Motor power | Fan weight | Sound level | Electrical frequency |
|---|---|---|---|---|
| HF800 | 0.5 HP | 106 lb | Under 57 dBA | 60 Hz |
| HF1200 | 0.5 HP | 124 lb | Under 57 dBA | 60 Hz |
| HF1600 | 0.5 HP | 140 lb | Under 57 dBA | 60 Hz |
| HF20 | 1.5 HP | 218 lb | Under 59 dBA | 55 Hz |
| HF24 | 3.0 HP | 262 lb | Under 59 dBA | 50 Hz |
| E6 10 Foot | 0.5 HP | 95 lb | Under 57 dBA | 60 Hz |
| E6 12 Foot | 0.5 HP | 112 lb | Under 57 dBA | 60 Hz |
| E6 16 Foot | 0.5 HP | 126 lb | Under 57 dBA | 60 Hz |
| E6 20 Foot | 1.5 HP | 197 lb | Under 59 dBA | 55 Hz |
Input power for the 0.5 HP fans is 110 to 120 V single phase, 208 to 240 V single phase, 208 to 240 V three phase or 460 to 480 V three phase. The 1.5 HP fans take 208 to 240 V single phase, 208 to 240 V three phase or 460 to 480 V three phase, and the 3.0 HP HF24 takes 208 to 240 V or 460 to 480 V three phase. Regardless of whether the input is single or three phase, power to the fan motor is always three phase.
Every motor is totally enclosed and fan cooled. HF Series fans ship with a NEMA 1 wall mounted VFD with safety disconnect, on and off toggle and speed pot. Essential 6 Series fans ship with a VFD. Safety features on both include a safety cable, hub clips, hub retainer, dual method fastening of all joined components and an integrated sprinkler shut off. The warranty is 5 years on all parts.
Request a quote or call (216) 663-8830. Humongous Fan, 23103 Miles Road, Cleveland, Ohio 44128.
American Made HVLS Fans designed with
Performance Engineered Blades™
23103 Miles Rd, Cleveland, OH 44128
Humongous Fan designs and manufactures HVLS fans in Cleveland, Ohio, engineered for maximum airflow, energy efficiency, and durability across any large space. One fan moves massive volumes of air silently, reducing HVAC costs and replacing dozens of portable units. Built for warehouses, manufacturing facilities, distribution centers, gyms, hangars, barns, and beyond, Humongous Fan delivers industrial-grade construction, precision engineering, and long-term reliability in every system.
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