Ceiling fans are a boon to any homeowner, and there are good reasons why these cooling fixtures can be found in any home. The motor’s top speed and the amount of air it pushes are vital to the fan’s capabilities. So, picking just any fan and installing it in just any room would be unwise and careless.
In our previous blog post on ceiling fan installation, we touched on the need to choose the right fan. This time, we want to discuss what CFM is and why it is important to consider in every fan choice.
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What is CFM?
Even though you cannot see it, air occupies space. Every room in your home is full of it. When it lingers for too long, the area can feel stuffy and heat can settle in. If you move the air around, the ensuing breeze can feel cool and refreshing. This is why hot days do not feel so bad when the wind blows.
Ceiling fans are designed to displace air and put it into motion. Not all of them do it equally, though, which is where CFM enters the picture. The term stands for cubic feet per minute — a unit combining space and time. It demonstrates the amount of air something can disperse within 60 seconds.
As we said earlier, all the space around you is filled with air. You disperse it just by being present, though your CFM would be very low. Blowing out of your mouth would be an increase in CMF, but again very low. Your home’s air conditioning offers, on average, 400 CFM. Ceiling fans are great because even the ones with the lowest CFM are counted in the thousands.
What Affects CFM?
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Various features distinguish ceiling fans with high CFM — also called airflow — from those with low CFM. Many are in the fan’s blades. Have you ever wondered why they do not lie perfectly flat? The pitch, or angle, at which the blade is tilted is what allows it to displace air. The material and shape can affect it as well. Attractive palm fronds have a give which lessens the amount of air they can move while a solid wood blade has a firm resistence that effectively pushes the air. Shape also matters, the classic oar shape is considered the most efficient, but not always the most attractive. Blades that simply end with a point may have a subtle CFM difference from those that do not. Longer and wider blades may allow for greater airflow, but they are also heavier and require a stronger motor to push them well. In fact, potential blade variations are innumerable making it impossible to determine CFM by the blades alone.
Another unit of measurement is rotations per minute, or RPM. It is the number of times the blades make a full circle within 60 seconds. If a particular fan’s speed is increased (for example, moving from medium to high speed) the RPM is increased, and the CFM is increased the same percentage as well.
The real issue in determining how much air a fan can push is the power of the motor in combination with the blade shape, material, and pitch – which would be impossible for anyone to figure out on their own or to compare to another fan. CFM (Cubic Feet per Minute) is the solution the industry came up with a few years ago as the new standard of measurement. Each fan design is tested in a laboratory to see how many Cubic Feet of air it moves within one Minute (CFM). That number can be easily compared with other fans.
Choosing the Right Airflow
CFM is one of the most important bits of data to check when shopping for ceiling fans. With that said, it is not the only one worth knowing about – efficency may also play into your final decision.
Ceiling fans are inherently efficient and have very low energy requirements, but they still require electricity to work their magic, and some require more than others. The most efficient fan offers the lowest wattage together with the highest CFM which gives excellent airflow on little power, and the most efficiency for your buck – the greenest of inheritantly green ceiling fans.
We should note that small rooms don’t require the same amount of air flow that large rooms require – a fan’s size and ability to move air varies with the blade and room size. However, an often-overlooked factor is that powerful fans with large blades move significant air on high speed, but those same fans move the same amount of air at medium speed as lower quality fans do at their highest speed. Also, the powerful fans at medium speed move air more gently than smaller fans at high speed – which often have a gale force effect.
The Benefits of High CFM
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So when would high CFM be appropriate? The good thing about fans with this capability is that they can cool down large spaces. For example, when one AC vent is not enough to beat the heat in a large living room, install a high power ceiling fan there.
One benefit that cannot be ignored is the cost of running ceiling fans – even the most powerful cost only pennies per day to operate. Also, if you couple your ceiling fan with your home air conditioner you can increase your thermostat by 4 degrees or more, lowering your A/C bill and keeping your comfort level the same.1
Due to their power, fans in this category tends to be larger and heavier. That may sound concerning, but it is precisely why manufacturers take great care to reinforce their stability. Lighter, inexpensive fans may disturb you by shaking when hitting their top speed. In contrast, fans with high CFM are more likely to hold strong and stay still. The extra quiet alone may make them a worthwhile purchase.
Shop for Fans with High CFM Today
Knowing about CFM is invaluable when shopping for ceiling fans. It can make the difference between a warm room and a balmy one, as well as between a high energy bill and a reasonable one. We hope the information we provide here helps you make an informed purchase.
If you seek high-quality fans with high CFM , you can shop hundreds of products here at the Trading Post Fan Company. All of these fans come with great efficiency, affordable prices, and lifetime motor warranties. If you do not know which CFM level is best for your home’s needs, feel free to call us at 877-724-2326 or email us at [email protected]. We strive to help customers find the best ceiling fans from the best brands to suit your specific situation. Our team will be happy to assist you, so reach out today.
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