Understanding About Ceiling Fan Air Flow

When choosing ceiling fans, the first impression is look and design, and what’s more than that? Another thing come in your mind must be efficiency of air flow but what actually is the air flow? there are a lot more factors that go into a fan that produces the best airflow.

The first thing to know is the difference between CFM and Air velocity.

• CFM (cubic feet per minute) measures the volume of air a fan moves in cubic feet.
• Air velocity relates to the speed the airflow is moving and is traditionally measured using miles per hour (mph).

What about the size?

The first thing to consider is the size of the room. The square footage of a room dictates how big the ceiling fan will need to be because a fan that is too small or big for a space will not circulate the air properly. You can measure a ceiling fan’s size by recording the diameter of its blade sweep.

We have a quick ceiling fan size guide as below:

Hanging height?

the bottom of the fan should be at least 7 feet off the floor, 8-9 feet will allow for optimal circulation. For higher ceilings, you can use fans with downrods, such as the Ball Ceiling Fan, to achieve the right height. The more space between the ceiling and the blades, the better for air flow and circulation.

Here’s a quick ceiling fan downrods height guide as below:

What if I have a sloped ceiling?

Aside from hugger fans, most fan canopies can accommodate some degree of slope-usually up to 30 degrees. An additional longer downrod may need to be purchased to ensure enough blade clearance. Or you may need an angle mounts.

More deeply, how the ceiling fan actually work?

Other than the basic sense that a ceiling fan rotate pinched blades to make the wind and cool the body. While it may enhance the effectiveness of your A/C or heating system by circulating that cooled or heated air, a ceiling fan on its own cannot actually change the temperature of a space.

How CFM do with the air flow?

CFM measurements are taken when a fan is on high speed, then that number is divided by the watts used. This means that the higher the CFM, the more efficient the fan. But which CFM is the best?

Good CFM ranges from 4,000 to 5,000

Better ranges from 5,000 to 6,000

Best is over 6,000

DC Motor ceiling fan and benefit?

Nowadays DC Motor Fans are becoming more common. First is… mostly they consuming less than 70% of the power of a typical ceiling fan. DC motor fans have a slightly higher upfront cost than regular ceiling fans since they need a more expensive electronic speed controller. However, their benefits more than make up for it. These benefits include:

Virtually silent operation

Much smaller motors that result in smaller, lighter fans

Efficient energy use that prolongs the fan’s life span

Higher torque resulting in faster startup speeds

The possibility for up to 6 different speeds

Lastly… the blades.

The blades of a ceiling fan becoming less of a question of function and more of personal choice with advancements in technology.

It used to be the case that 5-6 blades would get you more efficiency as opposed to 3-4 blades. but that’s no longer the case. Since the CFM is the measure for a fan’s airflow efficiency, the number of blades is more related to embellishing the style for your space. For example, a four or five blade ceiling fan provides a more conventional, balanced look, whereas a fan with two or three blades possesses a modern and sleek style.

Here’s all the simple explanation about air flow and factor that effect the efficiency of the ceiling fan. The ceiling fan is not a thing that you should just get cheap or so easily pick, other than design you also need to consider about size and safety to suit your space as well.

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