It's the key metric when comparing ceiling fans. Your average fan moves about 4,000 CFM, while the most powerful fans move around 10,000 CFM.
What is a good CFM for a fan? This entirely depends on the application. For a residential fan you might have in your living room, a CFM of 5,000-6,000 might be totally sufficient. For large warehouses, you might want a fleet of large-diameter HVLS fans that each have a CFM of over 300,000.
Generally speaking, a typical fan will use between 40 and 100 watts when set to a high speed. On average, ceiling fans typically use around 50 watts of electricity. To save energy and money, it is best to use a fan only when necessary and set it to a lower speed when possible.
The higher the CFM, the more air the fan circulates, making it more effective at cooling your room. For a standard room with an 8-foot ceiling, a fan with a CFM rating of 4000 to 5000 is generally sufficient. However, for larger rooms or rooms with higher ceilings, you might need a fan with a higher CFM rating.
A combination of two key factors determines how powerful a fan is: the size of the fan and its speed settings. The higher the power output of your fan, the higher the airflow will be.
Vornado 660 Large Air Circulator
This powerful fan moves air effectively around a room thanks to its 1,638-cubic-foot-per-minute airflow—the highest of any of our picks.
A standing fan generally uses between 40 to 100 watts, depending on the model and speed settings. This makes it a versatile option for various room sizes and cooling needs. A 20-inch box fan usually consumes around 50 to 100 watts, based on its speed and efficiency.
Whilst 13p isn't much, that cost can add up over time especially if you've got multiple fans in the house. There are a couple of other things you can do around the house to reduce the need for a fan at night: Keep blinds and curtains shut throughout the day to reduce direct sunlight coming in. Shut internal doors.
On the other hand, if your CFM is too high for your room size, it can cause ventilation problems. Too much air results in too little ventilation, which in turn causes high humidity. The excess moisture in the air can then lead to mold and mildew, as well as other problems.
Large ceiling fans (56-72 inches)
These fans can move large amounts of air due to their large blade spans and powerful motors. For example, a 72-inch fan has a maximum speed of 9,000 to 11,000 CFM.
It is considered that 135 CFM is needed per square foot of space. So 13.5 CFM would be required for a 100-square-foot area. A room of 1,000 square feet would require 135 CFM.
Thicker = better
Basically, the thicker the fan, the more air it can push at any given speed as compared to a thinner fan at that same speed. This means that if you go from 25mm fans to 30mm fans, you can run them slower, and therefore more quietly without sacrificing cooling performance.
Three-blade fans are generally more efficient at moving air, resulting in better airflow. They often feature a sleek, modern look that fits contemporary decor. They are typically less expensive than fans with more blades.
The average home refrigerator uses between 350-780 watts. Some refrigerators are more energy efficient than others, so you'll want to check the label on yours or look it up online to see how much power it consumes.
If you have electric heat, heating your home uses the most energy. This can account for more than 30% of your electricity consumption. And if you have air conditioning, this number rises even higher. All told, your efforts to stay comfortable can use between 40% and 50% of the electricity in your home.
Fan wattage
Fans with smaller wattages of around 40w use less electricity to cool a room. Bigger fans with a wattage of say 120w use more electricity to cool a room. However, a big fan would often have a high RPM and CFM (mentioned later) to make them more energy efficient.
Fans with fewer blades are lighter and create less drag, which means they can rotate faster and deliver more air effectively. Fans with more blades tend to consume more energy, but they are quieter and more balanced than models with fewer blades.
Blade pitch and motor power play a much more significant role in a fan's efficiency. Similar to an airplane wing, the angle of a ceiling fan blade, known as its pitch, affects how efficiently it moves air. A higher pitch creates a stronger force, pushing more air with each rotation.
Airflow: Blowing volumes
Fans optimized for high airflow are often used to move larger amounts of unrestricted air across a broader area. This makes them perfect for general case cooling or directing air towards hot spots without obstructions.
CFM, or Cubic Feet per Minute, is essentially how much air your fan can move. It's like measuring how well your fan can take deep breaths and exhale, circulating air through your PC's innards to whisk away the heat.
The best forecast is that the target static efficiency for non-ducted fans will be 62% at the fan shaft, and the target total efficiency for ducted fans will be 68% at the fan shaft.